The brakes on a Case 480C, 580C, or 580D backhoe are a self-adjusting differential brake system bolted to the side of the transaxle. The brake housing itself is dry — no oil, no fluid sharing with the differential. A seal at the bearing plate keeps transaxle oil on the diff side and out of the brake assembly. When that seal fails, gear oil migrates into the dry brake housing, soaks the bands and disc linings, and ends the life of the brake pack. That's the failure mode most owners don't catch in time, and it's why a "simple brake job" turns expensive when the bearing-plate seal goes ignored.

This guide walks the complete service procedure straight out of the Case 580C factory service manual (Sections 7106 and 7122) — master cylinder rebuild, slave cylinder rebuild, brake hose check, brake disc and band servicing, the bleed procedure, and the exact torque specs and free-travel adjustments that make the system work.

How the C/D series brake system works

Two separate master cylinders sit under the floor plate — one for each brake pedal. Each master cylinder feeds hydraulic pressure through a steel line and a short rubber hose to a slave cylinder mounted on the outside of the brake housing. The slave pushes a lever that rotates an actuating drum; four steel balls ride in ramped recesses between the drum and a splined disc, and as the drum rotates, the balls climb the ramps and force the disc apart against the brake bands. The bands are mounted to a stationary housing, so when the disc clamps against them, the differential side gear stops turning — which stops the wheel on that side.

The brake housing is bolted to the outside of the transaxle case and is a sealed, dry chamber — it does not share oil with the transaxle, differential, or final drives. The brake shaft passes from the differential side gear, through a bearing plate with a seal, out into the dry brake housing where it splines into the disc assembly. As long as that bearing-plate seal is intact, the brake side stays bone dry the way Case designed it.

The self-adjusting mechanism uses a ratchet nut on the actuator rod that takes up slack as the brake lining wears. That's why the C/D brakes don't need manual adjustment under normal service — the slack ratchet does it for you. When the system fails, it's usually one of four things: that ratchet stops moving, the hydraulic side leaks (master, slave, or the rubber hose), the cups in a cylinder swell from contaminated fluid, or the bearing-plate seal fails and gear oil migrates into the dry brake housing and saturates the linings.

Symptoms: what each failure looks like from the seat

Most Case C/D brake jobs come in with one of six symptoms. Knowing which one tells you where to start:

If both pedals feel different from each other, that's a hydraulic problem on one circuit. If both pedals feel the same and the machine just won't stop, you're either looking at oil-soaked linings on both sides — which points back to a bearing-plate seal failure — or a contamination issue in the fluid that swelled both slave cylinder cups.

The bearing-plate seal failure that ruins brake packs

This is the failure mode that catches most owners off guard, and it's the reason a "simple brake job" turns into a four-figure repair if you ignore the early signs.

Remember the architecture: the brake housing on a 480C/580C/580D is dry. No oil belongs in there — ever. The brake shaft passes from the wet transaxle, through a bearing plate, into the dry brake housing. A seal at the bearing plate is the only thing keeping transaxle gear oil on the differential side and out of the brake assembly. When that seal fails — and on a 40-year-old machine, eventually it will — gear oil migrates down the shaft and into the brake housing where it has no business being. Friction linings don't dry out and don't clean up. Once they're soaked, they're scrap.

The tell-tale signs on the outside of the machine: a slow wet weep down the side of the transaxle near the brake housing, a rear axle oil level that drops over time without an obvious leak from the diff cover, or oil residue on the brake cover bolts when you pull them. Any of those is a bearing-plate seal call until proven otherwise.

What you'll need before you start

The full job — both sides — typically runs a long day for an experienced mechanic, or a weekend for someone working through it the first time. You only need to drain the transaxle if you find oil in the brake housing (meaning the bearing-plate seal has failed) and you're going to pull the bearing plate to replace it. If the housing comes out dry, the brake job is a self-contained dry repair.

If you don't have the rivet clinchers and you find your linings are worn but the discs and bands are otherwise sound, you have two options: take the parts to a local automotive brake shop that does industrial relining, or replace the assemblies outright. The factory manual specifically warns against trying to rivet linings with the wrong tooling — you'll damage the lining before it's seated.

Master cylinder rebuild (Section 7106)

Start at the top of the system. If the pedals are spongy or the floor plate is wet, the master cylinder is the place to begin — and on a machine this old, it's worth pulling both even if only one side is acting up. The internal parts (primary cup, valve seat, check valve, spring, piston, and snap ring) all live in a repair kit that costs less than a few hours of labor.

Removal

1. Remove the instrument panel per Section 8004.
2. Remove stoplight switches and brackets as an assembly if equipped.
3. Remove the cotter pin and clevis pin from the master cylinder. On power shuttle machines, the right-hand master cylinder clevis pin is held with E-clips — pull the inner E-clip to free it.
4. Disconnect the brake line at the master cylinder.
5. Remove the nuts and lock washers from the mounting bolts.
6. Hold the master cylinder with one hand and remove the mounting bolts. The spacers will drop to the floor plate if the bolts come completely out — catch them.

Disassembly and inspection

Empty the reservoir, secure the cylinder in a vise, and remove the rubber boot and push rod. Do not separate the clevis from the push rod unless you're replacing one of them — measure the overall length first so you can reassemble to the same dimension. Remove the snap ring from the bore and lift out the piston, primary cup, spring, check valve, and valve seat.

Inspect the bore for pitting, scoring, or rust. Light scoring can be cleaned up with a cylinder hone; heavy pitting means the cylinder is done — order a replacement master cylinder (L25419). Inspect the primary cup, piston, check valve, and valve seat for wear or scoring that could pass fluid. Check the return spring for cracks or distortion.

Assembly

Lubricate the bore, piston, and primary cup with clean brake fluid — never with oil. Install the valve seat, check valve, spring, primary cup, and piston in that order, then secure the assembly with the snap ring. Slide the push rod into the piston and attach the boot to the cylinder body.

Removing the brake housing from the transaxle

This is where the real work starts. The brake housing on each side bolts to the outside of the transaxle case and holds the disc, bands, actuator, and slave cylinder as a single assembly. Because the housing is dry, pulling it does not by itself release any transaxle oil — the bearing-plate seal stays in place sealing the diff side.

1. Disconnect the rubber brake hose (D66741) and the steel line at the slave cylinder. Cap the line.
2. Remove the brake lever return spring.
3. Remove the axle housing bolt that secures the return spring bracket.
4. Remove the brake housing retaining bolts (in a circle around the housing).
5. Pull the brake housing straight out from the transaxle case. The brake disc assembly will stay on the differential side gear splines — lift it off and set it aside.

With the housing off, take a hard look at the cavity. The brake housing should be bone dry. Any oil pooling, wet residue down the brake shaft, or slick film on the disc face means the bearing-plate seal has failed and gear oil is escaping from the transaxle into a chamber that's supposed to be sealed. That confirms two things: the brake pack is contaminated and needs to be replaced, and you need to drop the rear axle oil and replace the bearing-plate seal before reassembly. Order the seal kit before you go any further so the new parts don't go in to die a second time.

Servicing the brake disc and bands

Brake disc assembly

The disc assembly is two splined disc halves clamped together by springs around an actuating drum that holds four steel balls in ramped recesses. To service it:

1. Unhook the brake disc springs with a small slotted screwdriver.
2. Lift the splined disc off the actuating drum.
3. Inspect the discs and lining for excessive wear, warpage, loose lining, or oil saturation. Oil-saturated linings are not serviceable — replace them. The same goes for warped or heat-blued discs.
4. Inspect the four balls and the actuating drum recesses. Pits, flat spots, or roughness on either surface means the brake won't apply evenly. Replace as a set.
5. If installing new linings on serviceable discs: clean the mating surfaces, clamp the lining in place, push new rivets through from the lining side, and form the rivet head with a 3/16" tubular rivet clincher. Without the proper tooling, send the parts out or replace the disc assembly complete.

Brake bands

The bands wrap around the disc assembly and provide the friction surface the disc clamps against. To remove them, pull the cotter pins from the band and link clevis pins, remove the band anchor bolt, unhook the band return springs, and lift the bands out of the housing.

The same inspection criteria apply — oil saturation, warpage, loose lining, and excessive wear are all condemn calls. If you're relining bands rather than replacing them, use a 9/64" tubular rivet clincher (smaller than the disc rivets). Replacement bands are available as a matched pair under part number 249018A3, and the brake pack assembly 249022A3 contains the bands, drum, pressure plate with internally riveted discs, springs, and the four actuating balls as a complete service unit — that's almost always the right call on a machine that hasn't seen brake service in decades.

Slave cylinder and brake hose service

The slave cylinder mounts to the brake lever and converts master-cylinder fluid pressure into the mechanical force that rotates the actuating drum. Same story as the master cylinder — internal cups and seals fail with age, and a leaking slave is one of the most common reasons one side of the machine won't brake. The short rubber hose that feeds it fails just as often.

Removal and disassembly

1. Remove the bolts securing the cylinder to the brake lever.
2. Remove the weather seal boot from the cylinder body.
3. Pull the piston retaining snap ring out of the bore.
4. Remove the piston assembly from the cylinder body.
5. Blow the bore out with compressed air and check it for roughness. Hone if necessary to clean it up; replace the cylinder if pitting is deep.

Assembly

The piston rebuild kit contains a new O-ring, a split back-up ring, and a new boot. Install the O-ring on the piston first, then the split back-up ring next to it on the outboard side. Clean and lubricate the piston and bore with clean brake fluid — the manual is explicit on this point: do not use oil as a lubricating agent. Oil will swell the rubber and you'll be rebuilding the slave again in a year.

1. Drop the piston into the bore.
2. Install the piston retaining snap ring.
3. Install the bleeder screw and torque it to 10 to 50 in. lbs.
4. Install the new weather seal boot.
5. Place the cylinder on the brake lever and start the mounting bolts.
6. Push the push rod through the boot opening until it contacts the piston.

If you're rebuilding rather than replacing, the brake cylinder resealing kit (A52277) contains the right O-ring, back-up ring, and boot. For a complete replacement cylinder, the correct part depends on which machine you're working on:

• 480C and 580C — order the A51976 brake slave cylinder (also interchanges with A148562).
• 480D, 580D, and 580 Super E — Case upgraded the slave on the D series; order the A168473 wheel slave cylinder.

Replace the rubber brake hose

While you have the slave cylinder off, replace the rubber brake hose that runs from the steel line to the cylinder. The D66741 brake hose fits 480C, 480D, 580C, 580D, and 580 Super E — it's 10-5/8" long and connects the steel line to the slave inlet. On these machines it's a known failure point that produces every symptom a bad slave does: spongy pedal, weak braking on one side, fluid weep at the cylinder. Replace both sides. The hose costs about the same as one bleed-and-test session, and there's no good reason not to.

Reassembly and torque specs

With the bands, disc, slave cylinder, and brake hose serviced, reassemble the brake housing in this order: actuator rod with the inner and outer band links attached, ratchet nut with a new O-ring on the adjusting rod, anchor bolt through the pivot ends of both bands, clevis pins through the bands and links secured with new cotter pins, then the cam return spring and rod, lever pin retained with a new roll pin, and the band retractor springs in the cover recesses.

Install the brake disc assembly onto the differential side gear splines. The splined disc side must face the transaxle case. Set the housing over the disc and start the housing bolts.

Apply Permatex #2 to the first few threads of the axle housing bolt before installation — it threads into the oil reservoir side and needs to seal.

Adjustment and bleeding procedure

Setting slave cylinder free travel

This step is non-negotiable and the manual carries a hard caution on it. With the brake housing torqued down and the lever installed, work the brake lever up and down to tighten the self-adjusting ratchet until you have 0.375" of free travel at the brake cylinder.

Reinstall the brake lever return spring

The lever return spring extends to 6" at approximately 25 lbs. Without it, the brake won't fully release on pedal lift-off.

Bleeding the system

Bleeding follows standard hydraulic brake practice. Fill both master cylinder reservoirs with fresh DOT 3 brake fluid. Have a helper pump the pedal three to five times and hold pressure. Crack the bleeder on the slave cylinder until fluid (then clean fluid) flows. Close the bleeder before the helper releases the pedal — releasing with the bleeder open pulls air right back in.

Work one side at a time, keeping the reservoirs topped up. Continue until both bleeders pass clear fluid free of air bubbles, then pump both pedals together and check for a firm, even feel. The pedals should feel identical with the brake-lock pin engaged.

Parts reference and kit options

Three ways to approach the parts side of this job, depending on what you found when you pulled the housing:

Basic brake replacement kit

The Case 480C/580C Basic Brake Replacement Kit (CS-BH-BK) covers the brake pack consumables for one side — bands, discs, drum, balls, springs. If your hydraulic side is healthy and you just need to replace worn or oil-soaked friction parts, this is the kit.

Deluxe (comprehensive) brake replacement kit

The Case 480C/580C Comprehensive Brake Replacement Kit (CS-BH-BK-D) bundles the brake pack with seals, hydraulic components, and the rest of the service-grade parts you should be replacing while you're in there. It's priced for a complete one-side rebuild — and on a 40-year-old machine, "while you're in there" applies to almost everything.

The bearing-plate seal kit (don't skip this if there's any oil)

The brake backing plate bearing & seal kit (CS-580-BPK) contains the seal that keeps transaxle gear oil where it belongs — on the differential side, not in the dry brake housing. If you find any oil in the brake housing when you pull the cover, this kit must go in at the same time as the brake pack. It is, by a wide margin, the single most common reason a brake job doesn't last on these machines.

Individual replacement components

Full category browsing for the C-era machines lives at 480C/580C brake parts; for the D-era machines, see 580D/480D brake parts. The complete Case backhoe brakes landing page is here.