Brake Booster And Master Cylinder testing procedure...
11-13-2003, 08:15 PM
#1
Honda-Tech Member
Thread Starter
Brake Booster And Master Cylinder testing procedure...
I just typed this up in a post so I figured I'd make a new one so it's easily searchable...
Functional Test...
1. With the engine stopped depress the brake pedal several times then depress the pedal hard and hold that pressure for 15 seconds... If the pedal sinks there is a problem with the master lines or caliper.
2.Start the engine with the pedal depressed... If the pedal sinks slightley the vacum booster is funtioning properly. If the pedal does not vary the booster or check valve are faulty.
LEAK TEST...
1. Depress the brake peadal with the engine running then stop the engine. If the pedal height does not vary while depressed for 30 seconds the vacuum booster is OK... if the pedal rises the booster is faulty.
CAUTION: Do not try to disassemble the booster
Replace the booster assembly with a new one
2. With the engine stopped depress the brake pedal several times using normal pressure. When the pedal is first depressed, it should be low. on consectutive applications the pedal height shoud gradually rise (pumping up the brakes). If the pedal position does not vary check the booster check valve.
CHECK VALVE TEST:
1. Disconnect the brake booster vacuum hose at the booster.
2. Start the engine and let it idle. There should be vacuum available. If no vacuum is available the check valve is not wroking correctly... replace the check valve and re-test.
Taken from helms.
Functional Test...
1. With the engine stopped depress the brake pedal several times then depress the pedal hard and hold that pressure for 15 seconds... If the pedal sinks there is a problem with the master lines or caliper.
2.Start the engine with the pedal depressed... If the pedal sinks slightley the vacum booster is funtioning properly. If the pedal does not vary the booster or check valve are faulty.
LEAK TEST...
1. Depress the brake peadal with the engine running then stop the engine. If the pedal height does not vary while depressed for 30 seconds the vacuum booster is OK... if the pedal rises the booster is faulty.
CAUTION: Do not try to disassemble the booster
Replace the booster assembly with a new one
2. With the engine stopped depress the brake pedal several times using normal pressure. When the pedal is first depressed, it should be low. on consectutive applications the pedal height shoud gradually rise (pumping up the brakes). If the pedal position does not vary check the booster check valve.
CHECK VALVE TEST:
1. Disconnect the brake booster vacuum hose at the booster.
2. Start the engine and let it idle. There should be vacuum available. If no vacuum is available the check valve is not wroking correctly... replace the check valve and re-test.
Taken from helms.
11-14-2003, 04:14 AM
#2
Re: Brake Booster And Master Cylinder testing procedure... (NonovUrbizniz)
That check valve test shows that it flows properly. To check if it seals properly, wait a while after you turn off the engine. Pull the fitting where the hose attaches to the booster, there should STILL be vacuum in there.
How long do you wait? A couple hours? My Saabs would hold vacuum in the booster overnight. I've never tried it on the Hondas.
How long do you wait? A couple hours? My Saabs would hold vacuum in the booster overnight. I've never tried it on the Hondas.
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