Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS1996SC 400REPAIR AND DIAGNOSISBRAKESMECHANICAL - HYDRAULICDISC BRAKESTESTINGPOWER BRAKE UNIT TEST
1996 Lexus SC 400
Power Brake Unit Test
1996 Lexus SC 400SECTION Power Brake Unit Test
- Release parking brake. With engine running, depress brake pedal and measure pedal reserve distance. Reserve distance is distance from floor pan to brake pedal when fully depressed. See MINIMUM BRAKE PEDAL RESERVE DISTANCE SPECIFICATIONS .
- If reserve distance is incorrect, bleed brake system, and recheck reserve distance. Depress brake pedal several times with engine off, and ensure pedal reserve distance does not change. Depress brake pedal, and start engine. If brake pedal goes down slightly, power brake operation is normal.
- Start engine, and run it at idle for 2 minutes. Depress brake pedal several times slowly. If pedal goes down farther first time and then gradually rises after second or third time, power brake unit is airtight. If pedal does not act as described, go to next step.
- Depress brake pedal while engine is running. Stop engine with pedal depressed. If pedal reserve distance does not change after holding pedal down for 30 seconds, power brake unit is okay. If pedal sinks, replace power brake unit.
MINIMUM BRAKE PEDAL RESERVE DISTANCE SPECIFICATIONS
| Application | (1) In. (mm) | ||
|---|---|---|---|
| SC400 | 3.50 (89) | ||
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RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.