brake booster system is working?

1993 TOYOTA COROLLA
109,000 MILES • 4 CYL • FWD • MANUAL
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GHATMAIL
  • MEMBER
  • 9 POSTS
How can I control my car's brake booster system is working correctly? Thank you so much H. Ebrahimi
Jan 28, 2011 at 12:44 PM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
If you wish to test the brake booster here are simple steps.

1. Turn engine OFF.
2. Pump the brake pedal a few times until it is hard.
3. Depress the brake pedal and hold.
4. Start engine.

If brake pedal softens and goes down when engine is started, the booster is working correctly.
Mar 29, 2021 at 11:20 AM
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