1997-2003 Aston Martin DB7 Parking Brake Problems and Adjustment

By Core Brake Parts Tech Team — Circleville, OH warehouse

The Aston Martin DB7 does not use a caliper-applied parking brake. Both the six-cylinder cars and the V12 Vantage use a separate set of handbrake shoes working inside the rear brake assembly, so a weak or dragging parking brake on a DB7 is almost always a shoe, cable or adjustment problem rather than a caliper fault. Most complaints are fixed by cleaning, adjusting and, where worn or contaminated, replacing the handbrake shoes.

How the DB7 Parking Brake Works

The DB7 service-brake system is a four-wheel disc setup, with vented rear discs clamped by conventional calipers for normal stopping. The parking brake is a separate mechanical system. The hand lever pulls a cable that spreads a pair of small brake shoes against a drum surface at each rear wheel. This layout is usually called a drum-in-hat or drum-in-disc design: the service brake and the parking brake share the same rear rotor assembly, but they never share friction material.

Specialist Aston Martin parts suppliers list dedicated handbrake shoes for both generations of the car:

• DB7 six-cylinder (1994-1999): handbrake shoes shared with the Jaguar XJ40, which reflects the Jaguar parts-bin origins of the early car.
• DB7 Vantage and Vantage Volante V12 (1999-2003): a different handbrake shoe set, paired with a larger vented 325 mm rear disc.

That split matters when ordering parts. The six-cylinder and V12 cars do not share handbrake shoes or rear pads, so confirm the engine before you buy anything for the rear axle.

Common DB7 Parking Brake Problems and Symptoms

Because the handbrake shoes only work when the car is parked, they see very little friction use. On a car that is often stored for months at a time, as many DB7s are, that low use is the root of most faults.

• Car rolls on a slope with the lever fully up. The shoes are worn, glazed, or adjusted too far from the drum surface, or the cable has stretched.
• Lever travels many clicks before it holds. Classic sign of shoe-to-drum clearance that has grown, or cable slack. Adjustment usually cures it.
• Rear wheel drags or one rear wheel is hot after a drive. A seized cable, a stuck actuating lever at the backing plate, or shoes adjusted too tight. Check which side is hot and start there.
• Brake warning light stays on with the lever released. The lever switch is not being released fully, often because the cable is binding or out of adjustment. Also check the fluid level, since the same light can warn of low brake fluid.
• Scraping or grinding from the rear at low speed. Rust scale on the drum surface, a broken return spring, or shoe lining that has separated from the shoe.
• Parking brake stuck on after storage. Shoes rusted to the drum surface or a cable seized in its outer sheath. Do not force the car to move with the brake locked.

Causes: Why DB7 Handbrakes Lose Grip

Disuse and corrosion

A car that sits builds rust on the inner drum surface of the rear rotor. The shoes then bear on a rough, uneven surface and hold poorly. Light rust usually cleans off; deep pitting means the rotor assembly needs attention.

Contamination

A leaking rear caliper seal or an axle oil seal can wet the handbrake shoes. Once lining is soaked in brake fluid or oil it will not recover and must be replaced, and the leak must be fixed first.

Cable stretch and seizure

Cables stretch over the years and the inner wire can corrode inside the outer sheath, especially on cars that see winter roads. A seized cable is a common cause of one side releasing and the other staying on.

Worn or glazed shoes

Repeatedly driving off with the handbrake partly applied glazes the lining. The shoes still look thick but have little grip.

How to Adjust the Parking Brake

Drum-in-hat parking brakes are adjusted in two stages: first the shoes at the wheel, then the cable at the lever or equalizer. Adjusting only the cable to take up worn shoes hides the real problem and can leave the brake dragging. Always use the procedure in the DB7 factory workshop manual for exact clearances, lever click counts and torque values. The general sequence for this type of brake is:

1. Chock the front wheels, release the lever fully, and raise and support the rear of the car safely on stands.
2. Back off the cable adjustment so the shoes are not being held by cable tension.
3. Remove each rear wheel. Inspect the drum surface inside the rotor hat and the shoes for rust, contamination, cracked lining and broken springs.
4. Adjust the shoes outward until the rotor can no longer be turned by hand, then back the adjuster off just until the rotor turns freely. A very slight drag is acceptable; a firm drag is not.
5. Repeat on the other side so both sides are set the same.
6. Take up the cable slack so the lever holds the car within the travel specified in the manual, with no drag when released.
7. Confirm the brake warning light goes out with the lever down, then road-test and check that neither rear wheel runs hot.

New handbrake shoes need bedding in so the fresh lining conforms to the drum surface. Follow the bedding procedure supplied with the shoes, then recheck the adjustment.

The Fix: What to Replace Together

If adjustment does not restore a firm hold, replace the handbrake shoes on both sides as a set, along with the return springs and hold-down hardware if they are rusty or weak. Replace a seized cable rather than trying to free it. If the drum surface inside the rotor is scored or deeply rusted, that is a good time to replace the rear rotors, and with the rotors off you will be fitting new rear pads anyway.

For the DB7 we carry EBC performance pads. Early supercharged 3.2 cars can use the EBC Redstuff ceramic rear pad set for the 1997-1999 DB7 3.2. For the front of the V12 Vantage there is the low-dust EBC Redstuff ceramic front pads for the 1999-2003 DB7 5.9, the EBC Bluestuff NDX front pads for track-day use, and the race-only EBC Orangestuff race pads. You can also browse our full brake pad range and brake hardware kits.

How Hard Is the Job?

A shoe adjustment is a moderate home job for someone comfortable raising a car safely and removing wheels. Replacing handbrake shoes is more involved because the rear caliper and rotor usually have to come off to reach them, and small springs must go back in the correct positions. Cable replacement on a low, older grand tourer can mean awkward access underneath. If you are not confident, a specialist familiar with the DB7 or its Jaguar relatives can do it quickly. Before any brake work, check for open recalls: the NHTSA recall lookup for a 2002 DB7 returns one campaign, 03V122000, which concerns a power steering hose that can contact the exhaust manifold, not the brakes.

Frequently Asked Questions

Does the DB7 have an electronic parking brake?

No. Every DB7 from 1994 to 2003 uses a mechanical hand lever and cables operating separate handbrake shoes at the rear wheels.

Why does my DB7 handbrake need so many clicks to hold?

Usually the handbrake shoes have worn or drifted away from the drum surface, or the cable has stretched. Adjust the shoes first, then the cable. If it still needs excessive travel, the shoes are worn or glazed.

Are DB7 six-cylinder and V12 handbrake shoes the same?

No. Suppliers list separate handbrake shoes for the 1994-1999 six-cylinder car and the 1999-2003 V12 Vantage, and the rear pads differ too. Confirm your engine before ordering.

Can I fix a weak handbrake by tightening the cable only?

It may seem to work, but it can leave the shoes dragging and it does not address worn or contaminated lining. Set the shoe clearance at the wheel first.

My DB7 has sat for months and the parking brake is stuck on. What should I do?

Do not try to drive it free. Release the lever, back off the cable, and gently rock the car or tap the rotor to break the shoes loose. Then inspect the shoes and drum surface for rust and contamination before driving.

Should I replace the rear rotors when I do the handbrake shoes?

Only if the drum surface inside the rotor hat or the disc face is scored, deeply rusted or under minimum thickness. If you do replace rotors, fit new rear pads at the same time.

Sources

1. SC Parts - Aston Martin DB7 braking system parts - handbrake shoes listed for DB7 six-cylinder (shared with Jaguar XJ40) and V12 Vantage; V12 vented 325 mm rear disc; separate rear pads by model
2. Tarox - Rear brake discs for Aston Martin DB7 - DB7 1994-2003 vented single-piece rear disc on a Lucas brake system
3. Wilwood - How to adjust the drum-in-hat internal parking brake - shoe adjustment method: expand until the drum will not turn, back off until it turns, slight drag acceptable
4. NHTSA - Recalls for 2002 Aston Martin DB7 - campaign 03V122000, power steering hose contact with exhaust manifold, no brake recall