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#1
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What could cause brake pedal to go to floor after brake service?
friends 77 240D, they took it to a corner brake shop, had front calipers and hoses replaced. a few days later while braking, the pedal went all the way to the floor, pumping it restored the brakes. has been happening off and on since then. i told them sounds like a bad MC, maybe the shop incorrectly bled the brakes and overran the seals in the MC... anything else to suspect? could incorrect brake hoses cause this? fluid level is fine and doesnt seem to be disappearing.
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1981 NA 300D 310k miles |
#2
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Sometimes, all it takes is a good dose of fresh brake fluid to do in a tired master cylinder.
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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl. |
#3
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exactly! the master cylinder is toast....probably from the flush....have a hard time believing they bleed the system via the pedal method.....you can't blame them for a 35+ year old master cylinder for failing....
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#4
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i should mention the MC is only 2 years old though
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1981 NA 300D 310k miles |
#5
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Regardless of what the shop did, a good master cyl should tolerate full stroke. Rebuilt masters usually have a pretty rough bore, this leads to rapid seal wear. Wet fluid can corrode the bore pretty rapidly causing the same effect.
Changing the fluid is sometimes a short term fix, ( new fluid has fresh seal swelling additives ) If the hoses don't leak, they are not the cause of the problem. Don't drive the car, change the master cyl. |
#6
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i mean, i agree and from the symptoms and my own experience with a failed MC, thats what i think it is. what if the calipers were not bled. what kind of symptoms could that cause?
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1981 NA 300D 310k miles |
#7
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You would have a low pedal every time.
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#8
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thanks for replies! was hoping to track down a problem that would have been cheaper than another master cylinder
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1981 NA 300D 310k miles |
#9
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Your probably going to have to figured out the problem on your own....check the obviously, fluid level...and leaks.....then rebleed the brakes....and then if its still not fixed its the mc...
is this a manual? if so, its possible the slave cylinder is leaking or the clutch wasn't bleed correctly...
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#10
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oh yeah should have mentioned that, it is an automatic
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1981 NA 300D 310k miles |
#11
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Answer
Quote:
http://www.peachparts.com/shopforum/diesel-discussion/347318-brake-system-bleeding-master-cylinder-bleeding-damage-warning.html .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
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