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Old 08-15-2017, 12:21 PM   #1
fleezy
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Default Rock Hard Brakes in the mornings

Lately my brake pedal has been rock hard in the mornings before I start my car.

This is a new development.

I have bled my brakes to remove any air from the lines, but the problem persists.

ideas?
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Old 08-16-2017, 01:34 AM   #2
Charlie-III
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An air leak in the vacuum booster that removes the help it should be doing? Once the engine is running, it keeps pulling a vacuum so the pedal feels better?
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Old 08-16-2017, 02:38 AM   #3
fleezy
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Quote:
Originally Posted by Charlie-III View Post
An air leak in the vacuum booster that removes the help it should be doing? Once the engine is running, it keeps pulling a vacuum so the pedal feels better?
link to a brake booster diagram?
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Old 08-16-2017, 08:34 AM   #4
Josh R.
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Quote:
Originally Posted by fleezy View Post
Lately my brake pedal has been rock hard in the mornings before I start my car.

This is a new development.
Don't worry, it's called "Morning Brakes" and it's 100% normal and natural. No need to feel embarrassed.
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Old 08-16-2017, 11:09 AM   #5
fleezy
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Quote:
Originally Posted by Josh R. View Post
Don't worry, it's called "Morning Brakes" and it's 100% normal and natural. No need to feel embarrassed.
it's never embarrassed when i wake up an my "brakes" can shatter diamonds

i found this:



i'm assuming the only vacuum associated with the boost is the one hose?
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Old 08-16-2017, 11:34 AM   #6
Charlie-III
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Yes. The big round part (goes between firewall and brake master) is the booster. Engine vacuum goes through the hose to the booster.

You can sorta test this by running the engine and pumping the brakes. Then, turn the engine off and pump the brakes. There is a little reserve capacity left in the booster so you still have brakes when moving and the engine stalls. Engine off, each time you pump the brakes the pedal should get stiffer as you reduce the help the booster can give.
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Old 08-16-2017, 04:35 PM   #7
fleezy
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Quote:
Originally Posted by Charlie-III View Post
Yes. The big round part (goes between firewall and brake master) is the booster. Engine vacuum goes through the hose to the booster.

You can sorta test this by running the engine and pumping the brakes. Then, turn the engine off and pump the brakes. There is a little reserve capacity left in the booster so you still have brakes when moving and the engine stalls. Engine off, each time you pump the brakes the pedal should get stiffer as you reduce the help the booster can give.
so, that doesn't happen. will look into it!
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Old 08-17-2017, 12:12 PM   #8
fleezy
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Originally Posted by fleezy View Post
so, that doesn't happen. will look into it!
so, it DOES pump up to solid pedal with the engine off... maybe my bleed was just ****!
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