1984-1996 Pontiac Firebird Parking Brake Problems and Adjustment

By Core Brake Parts Tech Team — Circleville, OH warehouse

If the parking brake on your 1984-1996 Pontiac Firebird pulls up high and still lets the car creep on a slope, the problem is almost always adjustment, not the cable. On rear-disc Firebirds the parking brake lives inside the rear calipers and is supposed to adjust itself; when that self-adjuster stops working, the lever runs out of travel before the pads clamp the rotor. Rear-drum cars have a different, simpler fix. This guide covers both.

Which Parking Brake Does Your Firebird Have?

The 1984-1996 range spans two generations of Firebird, and the parking brake design depends on whether the car has rear drums or rear discs. Many base cars in both generations left the factory with rear drum brakes, while performance models were built with rear discs. Pull a rear wheel and look: a drum is a round cover over the whole brake, a disc setup shows a rotor and a caliper.

• Rear drum cars: the parking brake cable pulls a lever inside the drum that spreads the brake shoes. Adjustment is done at the shoes (star-wheel adjuster) and, if needed, at the cable equalizer under the car.
• Rear disc cars, 1984-1992 (third generation): the cable pulls a lever on the back of each rear caliper. That lever turns a threaded shaft that pushes the caliper piston against the pad. An internal adjuster is meant to take up pad wear automatically.
• Rear disc cars, 1993-1996 (fourth generation): same basic idea. The 1993-1997 cars mechanically operate the rear calipers through the parking brake lever to squeeze the rotors. GM did not switch these cars to a separate drum-in-hat parking brake inside the rotor until 1998, so do not buy 1998-and-later parking brake shoes for a 1996 car.

Symptoms of a Firebird Parking Brake Problem

• The handle or pedal travels farther than it used to, or comes all the way up with little resistance.
• The car rolls on a driveway or hill with the parking brake fully set.
• A rattle from the rear on rough pavement. On rear-disc cars, an out-of-adjustment lever lets the inboard pad sit loose. A caliper maker's quick test is to grab the pad and shake it; if it rattles, the lever needs adjustment.
• The rear brakes drag or run hot after new pads or calipers were installed. That is the opposite problem: the caliper shaft was set too tight.
• The caliper lever does not return to its stop after you release the brake, which points to a weak or broken return spring or a sticking cable.

Why It Happens: The Self-Adjuster and the GM Recall

The rear disc calipers on these cars are designed to self-adjust as the pads wear, and the usual instruction is to apply and release the parking brake about thirty times to let the adjuster catch up. In practice, owners and techs find that it very often does not work. Corrosion, dried grease and wear inside the caliper stop the adjuster from ratcheting, so pad wear turns into extra lever travel until the lever bottoms out on its stop.

This was a known problem when the cars were new. NHTSA recall 91V055000, filed by General Motors in April 1991, covers early third-generation Firebirds with manual transmissions and rear disc brakes. The recall summary says the parking brake adjuster fails to operate after brake pad wear, so the parking brake will not completely hold the car on a slope, which can lead to rollaway. The remedy was to replace the nonfunctioning adjusters. Manual-transmission cars were singled out because a parked manual car relies on the parking brake alone, where an automatic also has the Park position. Check your VIN on the NHTSA recall site; a car this old will not get a dealer fix today, but the recall confirms what you are fighting.

Other causes to rule out:

• Worn lever or broken spring: on the later rear-disc cars, a worn finger end on the parking brake lever or a broken spring is a common reason the brake will not apply or release properly.
• Stretched or seized cable: a cable that is rusted in its sheath will not release fully, and one that has stretched will not pull far enough.
• Tapered pads: pads worn unevenly give the self-adjuster nothing consistent to work with.
• Rear drum cars: shoes that have not been adjusted out after wear, or a seized star-wheel adjuster.

How to Adjust the Rear Caliper Parking Brake

Do this with the car safely on stands, wheels chocked and the parking brake released. Work one side at a time.

1. Try the self-adjuster first. Apply and release the parking brake repeatedly (the commonly cited figure is about thirty cycles). If lever travel improves and the car holds, you are done.
2. Disconnect the cable. Unhook the cable and its return spring from the caliper lever so the lever moves freely.
3. Work the lever by hand. Push the lever forward and back repeatedly. On a caliper whose adjuster still works, the lever should move off its stop less each time. One brake caliper maker gives 3/8 to 1/2 inch of lever movement off the stop as the target once it is adjusted.
4. If it will not self-adjust, set it manually. A well-known third-gen method: remove the nut, lever and soft grommets from the back of the caliper, slip a large washer over the shaft as a spacer, and turn the shaft hex with a wrench until the pads are snug against the rotor. Then refit the lever so it has about one-third of its travel left to apply the brake, and secure it with the nut.
5. Reconnect and test. Reinstall the cable and spring, make sure the lever returns fully to its stop, spin the wheel to confirm no drag, then test the car on a slope.

Important: after installing new pads or a new rear caliper, set the parking brake lever before you pump the hydraulic brakes. The caliper maker warns that skipping this can leave you with no parking brake and can damage the brakes. Torque the caliper bolts and bleeder to the values in the factory service manual.

When to Replace Parts Instead

If the shaft will not turn, the lever will not return, or the adjuster will not ratchet no matter what you do, the caliper's internal adjuster is worn out. The right fix is a rebuilt or new rear caliper. Browse rear brake calipers and Cardone remanufactured calipers, and replace them in pairs so both sides apply evenly.

Replace at the same time:

• Rear pads. The self-adjuster needs flat, even pads. For rear-disc Firebirds we carry the Hawk HPS rear brake pad set for street driving and the Hawk HP Plus rear pad set for track days. Hawk lists this .540 inch rear pad for 1988-1997 Firebirds, Camaros and Corvettes, and notes it is made for iron rotors only.
• Rear rotors if they are grooved, lipped or below the minimum thickness cast on the rotor. See brake rotors.
• Hardware and springs, including the caliper lever return spring. See brake hardware kits.
• Rear drum cars: shoes and a new adjuster and spring kit from brake shoes.

How Hard Is This Job?

On a rear-drum Firebird, adjusting the shoes and cable is an easy driveway job with basic hand tools. On a rear-disc car, the self-adjust procedure is easy; the manual lever-and-shaft adjustment is moderate and takes patience, because you may need to repeat it a few times to get the lever position right. Replacing rear calipers is moderate and requires bleeding the brakes afterward. If the car will be parked on a hill, do not trust it until it passes a real slope test.

Frequently Asked Questions

Why does my Firebird parking brake handle come all the way up?

On a rear-disc car the caliper self-adjusters have stopped taking up pad wear, so the lever on each caliper runs out of travel. On a rear-drum car the shoes need adjusting. The cable is rarely the root cause.

Does pumping the parking brake really adjust the rear calipers?

It is designed to, and it is worth trying first, but on these older calipers the adjuster is often seized. If lever travel does not improve after repeated applications, adjust the shaft manually or replace the calipers.

Was there a recall on the Firebird parking brake?

Yes. NHTSA campaign 91V055000 covered early third-generation Firebirds with manual transmissions and rear disc brakes because the parking brake adjuster could fail after pad wear and let the car roll away. The fix was to replace the adjusters.

Do 1993-1996 Firebirds use drum-in-hat parking brakes?

No. The 1993-1997 cars apply the parking brake through a lever on the rear caliper. The drum-in-hat design inside the rear rotor started in 1998, so those shoes will not fit an earlier car.

Can I just tighten the parking brake cable?

On a rear-disc Firebird, tightening the cable to cover a failed caliper adjuster usually leaves the lever off its stop, which can make the rear brakes drag and wear quickly. Fix the adjustment at the caliper instead.

Should rear calipers be replaced in pairs?

Yes. Matching calipers apply the parking brake and service brakes evenly side to side. Install new pads with them and set the parking brake lever before pumping the pedal.

Sources

1. NHTSA recall data, Pontiac Firebird - recall 91V055000, parking brake adjuster failure after pad wear, rollaway risk, remedy
2. ThirdGen.org: Adjusting Rear Disc Brakes - thirty-application self-adjust, manual shaft and lever adjustment, one-third lever travel
3. TSM Manufacturing: Rear Caliper Parking Brake Lever Adjustment - lever travel off the stop, pad rattle test, adjust before applying hydraulics
4. LS1Tech: Camaro and Firebird Parking Brake Repair - 1993-1997 caliper-actuated vs 1998-2002 drum-in-hat, worn lever and broken spring failures
5. Hawk Performance HB112F.540 - rear pad fitment 1988-1997 Firebird, .540 inch thickness, iron rotors only