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brake problems

hi i have a vw passat and i have a problem with the brakes, is there anyone that can help?

With the car not running i can get a good solid pedal but if you start the car the brake pedal will travel a lot more, if you pump the pedal it goes solid but then slowly goes to the floor.

it started off having new brake pads all round and two new calipers on the front and a piece of pipe cut out and replaced, then the problem started after bleeding brakes again. so i replaced the master cylinder and it still happens then i replaced the back brake calipers cause i seen fluid on the piston, the problems still there so i asked a few people and they said try changing the servo so i have and it still happens. I have bleed the brakes over and over again, they dont seem to be loosing fluid, but the pedal still slowly bleeds off. has any one got any tips to help?

Reply to
stemotors
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Is the car equipped with ABS, and if so have you had the brakes bled with a scan tool?

nate

Reply to
Nate Nagel

The brake pedal slowly going to the floor sounds like a master cylinder piston bypassing fluid. I read where you said you replaced it, but that is the most common cause of your complaint, so I thought I would mention it. The test is to apply *light* pressure to the pedal and see if it sinks, then apply firm pressure and see if it holds any better. If both of those statements hold true, the cause is usually internal MC leakage.

Mentioning the year and what engine, trans, ABS or not, etc. might yield a better answer.

If you are getting air in your system after the initial pad and caliper replacement, you may have a poorly remanufacturered caliper / piston seal that is sucking air during pedal release. This process can take a long time to get even a small amount of air in the system, and can be nearly impossible to test. It may require eliminating all other possibilities before condemning a caliper. Most rebuilt stuff on the market is of questionable material and workmanship. Higher failure rates are going to be the norm when you are buying a typical loaded caliper for ~ $50 to $80.

Toyota MDT in MO

Reply to
Comboverfish

You don't cut out pieces of brake line, you replace the whole line.

Who did the work???

Reply to
Noozer

That was a little disconcerting to me as well. I figured that something got lost in the translation, i.e. a complete piece of pipe was relaced, but the OP didn't see it done and assumed that the process was a cut and splice affair. If his description is literal, then oh boy... one must wonder if the problem is self-induced.

Toyota MDT in MO

Reply to
Comboverfish

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