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Brake Pedal Goes to Floor - later, it's OK
01-03-2010, 01:07 PM
#1
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Member Since: Nov 2008
Location: Cary NC
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Brake Pedal Goes to Floor - later, it's OK
Background:
My 60K mile C5 recently had brake service done. Goop was put on the back of all the pads to reduce the initial bake pedal apply squeal. Worked fine. No other prior problems in past year with brakes.
Drove fine for 40-50 miles.
Parked overnight in garage. Coolant temp showed 46 degrees at start-up this AM. Put it in reverse and brake pedal goes to floor when backing out driveway. Makes air whooshing sound each time pedal is depressed. No leaks in car or on garage floor. After about 5 pedal depressions while in park and E brake on, I turn off car and let it sit. Felt none of the usual pressure in pedal, except for hearing the air sound.
Let it sit in the sun for about 90 min. and started it up and brake pedal & brakes now work perfect. Pedal pressure very firm with engine off. Fluid at proper level.
I'm sure the pistons in each caliper were pushed in to get the pads out and I just wonder if somehow all that messed up the (particles of crud?) fluid back at the master cylinder.
Or, should I just get a master cylinder?
My 60K mile C5 recently had brake service done. Goop was put on the back of all the pads to reduce the initial bake pedal apply squeal. Worked fine. No other prior problems in past year with brakes.
Drove fine for 40-50 miles.
Parked overnight in garage. Coolant temp showed 46 degrees at start-up this AM. Put it in reverse and brake pedal goes to floor when backing out driveway. Makes air whooshing sound each time pedal is depressed. No leaks in car or on garage floor. After about 5 pedal depressions while in park and E brake on, I turn off car and let it sit. Felt none of the usual pressure in pedal, except for hearing the air sound.
Let it sit in the sun for about 90 min. and started it up and brake pedal & brakes now work perfect. Pedal pressure very firm with engine off. Fluid at proper level.
I'm sure the pistons in each caliper were pushed in to get the pads out and I just wonder if somehow all that messed up the (particles of crud?) fluid back at the master cylinder.
Or, should I just get a master cylinder?
01-03-2010, 01:42 PM
#2
Tech Contributor
Background:
My 60K mile C5 recently had brake service done. Goop was put on the back of all the pads to reduce the initial bake pedal apply squeal. Worked fine. No other prior problems in past year with brakes.
Drove fine for 40-50 miles.
Parked overnight in garage. Coolant temp showed 46 degrees at start-up this AM. Put it in reverse and brake pedal goes to floor when backing out driveway. Makes air whooshing sound each time pedal is depressed. No leaks in car or on garage floor. After about 5 pedal depressions while in park and E brake on, I turn off car and let it sit. Felt none of the usual pressure in pedal, except for hearing the air sound.
Let it sit in the sun for about 90 min. and started it up and brake pedal & brakes now work perfect. Pedal pressure very firm with engine off. Fluid at proper level.
I'm sure the pistons in each caliper were pushed in to get the pads out and I just wonder if somehow all that messed up the (particles of crud?) fluid back at the master cylinder.
Or, should I just get a master cylinder?
My 60K mile C5 recently had brake service done. Goop was put on the back of all the pads to reduce the initial bake pedal apply squeal. Worked fine. No other prior problems in past year with brakes.
Drove fine for 40-50 miles.
Parked overnight in garage. Coolant temp showed 46 degrees at start-up this AM. Put it in reverse and brake pedal goes to floor when backing out driveway. Makes air whooshing sound each time pedal is depressed. No leaks in car or on garage floor. After about 5 pedal depressions while in park and E brake on, I turn off car and let it sit. Felt none of the usual pressure in pedal, except for hearing the air sound.
Let it sit in the sun for about 90 min. and started it up and brake pedal & brakes now work perfect. Pedal pressure very firm with engine off. Fluid at proper level.
I'm sure the pistons in each caliper were pushed in to get the pads out and I just wonder if somehow all that messed up the (particles of crud?) fluid back at the master cylinder.
Or, should I just get a master cylinder?
01-03-2010, 02:19 PM
#3
Team Owner
02-14-2010, 10:46 PM
#4
Burning Brakes
So if the pedal is firm with engine off, but will slowly lose brake pedal firmness when the engine is on, it sounds like the vacumm booster or hose, and not the master cylinder?
02-14-2010, 11:02 PM
#5
Burning Brakes
02-15-2010, 09:43 AM
#6
Intermediate
Thread Starter
Member Since: Nov 2008
Location: Cary NC
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Brake Pedal Goes to Floor - later, it's OK
It has only happened once more since original posting, and it was from a cold start, after sitting about 4-5 days. Problem went away after about 30 sec. of engine idling. No other failures.
02-15-2010, 10:01 AM
#7
Let it sit in the sun for about 90 min. and started it up and brake pedal & brakes now work perfect. Pedal pressure very firm with engine off. Fluid at proper level.
