TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
p.006
BAT/Brakes, ABS & TRAC Systems7 / 167
p.008
BRAKE BOOSTER OPERATIONAL TEST — MK4 Supra Brakes, ABS & TRAC Systems, page 7
100%
BR–7 BRAKE SYSTEM – CHECK AND ADJUSTMENT 4. CHECK PEDAL RESERVE DISTANCE Release the parking brake. With the engine running, depress the pedal and measure the pedal reserve distance, as shown. Pedal reserve distance at 490 N (50 kgf, 110.2 lbf): w/o TRAC: More than 72 mm (2.83 in.) w/ TRAC: More than 70 mm (2.76 in.) If the reserve distance is incorrect, troubleshoot the brake system. BRAKE BOOSTER OPERATIONAL TEST 1. OPERATING CHECK (a) Depress the brake pedal several times with the engine off and check that there is no change in the pedal reserve distance. (b) Depress the brake pedal and start the engine. If the pedal goes down slightly, operation is normal. 2. AIR TIGHTNESS CHECK (a) Start the engine and stop it after 1 or 2 minutes. Depress the brake pedal several times slowly. If the pedal goes down farthest the 1st time, but gradually rises after the 2nd or 3rd time, the booster is air tight. (b) Depress the brake pedal while the engine is running, and stop the engine with the pedal depressed. If there is no change in the pedal reserve travel after holding the pedal for 30 seconds, the booster is air tight. GOOD NO GOOD 1st 2nd 3rd BRAKE SYSTEM BLEEDING HINT: If any work is done on the brake system or if air in the brake lines is suspected, bleed the system of air. NOTICE: Do not let brake fluid remain on painted sur- faces. Wash it off immediately. 1. REMOVE RESERVOIR CAP Turn the reservoir cap to the "open" side and remove it. OPEN 2. FILL RESERVOIR WITH BRAKE FLUID Fluid: SAE J1703 or FMVSS NO.116 DOT3