PeachParts Mercedes-Benz Forum - no brake system pressure after bleeding

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It won't hold pressure with your foot on the pedal or it won't hold pressure with a pressure bleeder? If it won't hold pressure with a pressure bleeder, you have a leak! Make sure the brake booster isn't filling with brake fluid.

Sixto
87 300D

I second that. If your booster fills with too much brake fluid it will get into your engine oil and you'll need to change the oil too.

Brake fluid in the booster can also deteriorate the booster bellows/baffles (whatever they're called).

I used a fluid extractor to suck the fluid from mine and sprayed brake cleaner inside it and sucked that out, then used an air compressor to flow air into it to dry it. It's been about 1000 miles since I did that with no booster issues. Hopefully I'm in the clear.:)

Quote:

Originally Posted by sixto (Post 1973021)

I checked for leaks when the brakes were bleed after replacing one of the lines and there were none.

Before before starting the car the pedal was nice and firm but when I started the car the pedal went right to the floor.

things to take home from this brake experience

1. don't install rear calipers on upside down -the bleeder nipple should always be pointing UP - if installed upside down, there is air in lines every time you try to bleed

2. don't ream the pedal to the floor EVER. If you do, say goodbye to your old MasterCylinder and hello to a new one. Use a block and press gently.

3. If you want it done right, do it yourself. I think this is the most valuable lesson to take home. Thanks kids!

Have a good day sir

I apologize for any inconvenience caused.

And might I add don;t believe what most mechanics say because they lie or over exacerbate the situation to get your business. Very hard to find an honest independent mechanic.

I second the pressure bleeder suggestion, having made my own from a small plastic-bodied garden sprayer, a pressure gauge, a spare reservoir cap, and some tubing. It's an easy one-person job. You tend to use more brake fluid (since you have to fill the pressure bleeder) but fluid is cheap compared to master cylinders.

Quote:

Originally Posted by Jeremy5848 (Post 1975240)

True that.
Is there any reason why now that the system is pressurized that the pedal feel is so soft-ish? The pedal can be depressed half way until I get real good brake response- not exactly what I was expecting from all of this work. Will new front rotors improve the pedal feel? There are new hoses nd pads in the front, although on of the pads needed to be ground down after it was chipped during installation.

Oracle- lessons learned my man. that's all. If we can take something positive lesson from this it's that we not make the same mistakes again.

Quote:

Originally Posted by DubMutant (Post 1975307)

Yeah what I learned is I wont do this again and will do only work through a dealership. Too many people are too quick to blame the person who worked on the car and say they "broke" it when in fact they are wrong.

As they say you get what you pay for. Do expect a complete brake job for few hundred dollars? If you had paided me more then I would of tried harder.