Harder/Stiffer Braking
#16
04-03-2009, 05:37 PM
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Location: Indiana
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If you're losing vacuum you can check by following these steps:
1. Start truck let run just a minute and shut down
2. Back off the two 1/2 nuts holding Master Cylinder in place. slowly rock MC back and forth until you hear the vacuum release.
3. Tighten MC back up
4. Start truck again and let run a minute and shut down
5. Let truck sit for about an hour or two.
6. Unbolt MC again and listen for vacuum escape again. If you hear the same as before the vacuum is OK, if there is no noise or very little you have a leak.
1. Start truck let run just a minute and shut down
2. Back off the two 1/2 nuts holding Master Cylinder in place. slowly rock MC back and forth until you hear the vacuum release.
3. Tighten MC back up
4. Start truck again and let run a minute and shut down
5. Let truck sit for about an hour or two.
6. Unbolt MC again and listen for vacuum escape again. If you hear the same as before the vacuum is OK, if there is no noise or very little you have a leak.
1 - shut your engine off, pump brake pedal 5-8 times to deplete vacuum from the booster. Note how hard the pedal is.
2 - start the engine, let it run for a couple minutes, shut it off.
3 - come back in a couple hours. The booster should have held the vacuum so your pedal should not be hard till after you pump it several times.
If the pedal is hard. First try replacing the check valve. Its the plastic thing between the vacuum line and the booster. If this is leaking, it will give you a hard pedal with the engine off. This should be a cheap fix.
If you are still loosing vacuum, something is wrong with the internals of the booster. You need to replace the booster. (keep the extra check valve)
#17
04-03-2009, 09:37 PM
There is a much easier way to see if you have a vacuum leak.
1 - shut your engine off, pump brake pedal 5-8 times to deplete vacuum from the booster. Note how hard the pedal is.
2 - start the engine, let it run for a couple minutes, shut it off.
3 - come back in a couple hours. The booster should have held the vacuum so your pedal should not be hard till after you pump it several times.
If the pedal is hard. First try replacing the check valve. Its the plastic thing between the vacuum line and the booster. If this is leaking, it will give you a hard pedal with the engine off. This should be a cheap fix.
If you are still loosing vacuum, something is wrong with the internals of the booster. You need to replace the booster. (keep the extra check valve)
1 - shut your engine off, pump brake pedal 5-8 times to deplete vacuum from the booster. Note how hard the pedal is.
2 - start the engine, let it run for a couple minutes, shut it off.
3 - come back in a couple hours. The booster should have held the vacuum so your pedal should not be hard till after you pump it several times.
If the pedal is hard. First try replacing the check valve. Its the plastic thing between the vacuum line and the booster. If this is leaking, it will give you a hard pedal with the engine off. This should be a cheap fix.
If you are still loosing vacuum, something is wrong with the internals of the booster. You need to replace the booster. (keep the extra check valve)