Supra (A70)

1986-1993 / Coupe / Japan

All Supra (A70) problems All workshop problems

Critical Brakes

Front Caliper Seizure

Symptoms

The car pulls to one side under braking. One front wheel is noticeably hotter than the other after driving. Uneven pad wear. In severe cases, a dragging sensation and smell of hot brakes.

Cause

The A70 uses single-piston sliding calipers on the front. The caliper slide pins corrode and seize, preventing the caliper from floating properly. The piston seals harden and the piston itself corrodes in the bore. Cars that sit for extended periods are worst affected, as moisture in the brake fluid accelerates piston corrosion.

Fix

Strip, clean, and rebuild the calipers.

New seals, dust boots, and slide pin boots: $30-60 per caliper.

If pistons are pitted, replace them ($50-100 per caliper).

While apart, clean and grease the slide pins with high-temperature brake grease.

Replace all rubber brake hoses at the same time — collapsed hoses act as one-way valves, trapping pressure and causing the caliper to bind even after rebuilding.

Caliper rebuild cost: $100-300 per corner.

A common upgrade is fitting A80 (MK4) front brakes, which are a direct bolt-on with the correct adaptor brackets.

The A80 4-piston front calipers provide significantly better stopping power and heat management.

Full MK4 brake conversion including rotors, calipers, lines, and brackets runs $800-1,500 using secondhand parts.

Cost mentioned in fix

$30-60 per caliper$50-100 per calipercost: $100-300 per corner$800-1,500

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Other known issues

Common Brakes

Brake Master Cylinder Internal Bypass

The brake pedal slowly sinks to the floor under sustained pressure (sitting at a traffic light with foot on the brake). The pedal may feel normal on initial application but gradually loses firmness.

Common Engine, 7M-GTE (Turbo)

Head Gasket Failure

The head gasket blows, allowing coolant into the combustion chambers and/or oil passages. White smoke from the exhaust, coolant loss without visible external leak, overheating under boost, milky oil on the filler cap, and bubbles in the coolant overflow tank. In severe cases, hydrolock (coolant filling a cylinder and bending a connecting rod on startup).

Critical Engine, 7M-GTE (Turbo)

Low Oil Pressure at Idle

Oil pressure drops below 10 psi at hot idle. The factory oil pressure warning light may flicker or illuminate at idle, particularly in traffic on hot days. The engine may develop bearing noise (deep knocking from the bottom end).

Common Engine, 7M-GTE (Turbo)

CT-26 Turbo Failure

Loss of boost pressure, excessive oil smoke (blue/grey) on startup or deceleration, whistling or grinding noises from the turbo, and oil in the intercooler piping.

Critical Engine, 7M-GTE (Turbo)

Cooling System Inadequacy Under Boost

Coolant temperature climbs rapidly under sustained boost, particularly in traffic or on hot days. The temperature gauge sits higher than normal and doesn't recover quickly.

Common Engine, 7M-GTE (Turbo)

Fan Clutch Wear

The engine runs hotter than normal, particularly at low speeds and idle. The cooling fan doesn't seem to pull much air through the radiator.

All Supra (A70) problems