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Brakes go to the floor to stop....already replaced master cylinder and dont know symptoms of a bad hydrobooster.....i also already bleed mc and all brakes

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When you replaced the master cylinder , did you bench bleed it , in order to get all of the air out it, before installing it, and afterwards, it is recommendable to bleed all 4 wheels to get the air out also. "also some of the times , when a brake booster goe's bad the brake pedal can also become spongy.

Posted on Apr 03, 2011

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Brake pedal goes to floor after fixing leak in line and bleeding brakes

bleed the lines by the book if still does'nt work then bad master cylinder.

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a key might be the brake pedal.
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If it goes to the floor with resistance than there is still air in the lines.
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Don't know how you knew the master cylinder needed
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If you had braking issues & a fairly decent brake pedal
before new parts went on,then the system wasn't bleed correctly.

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Not likely that the booster is an issue. The booster would not be able to overcome the brake fluid compression.
First open and inspect all brakes for leaks, adjustment, etc. Check all brake lines.
So if no leaks, did the fluid go low in the MC? If so, pad consumption would eat more than a MC reservoir of fluid, and not require MC replacement, but rebleeding and top up of fluid. If the pads are worn, and you replace them, often this will expel air back through the MC.

If you determine the MC is faulty, bench bleed the new one before install, or you will have lots of problems getting air out....

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Replaced Master Cylinder and Brake Booster on 03 Bravada and pedal still drops all the way to the floor instead of stopping at half-way of pedal travel? No visible leaks in hydraulic system but it acts...

Did you replace the master cylinder and booster because of this? If so then did this problem follow any maintenance done on the brakes? Was there any leaks prior to the replaced parts?
The pedal dropping to the floor with no leaks would point to items you have already replaced or air in the brake lines. Normally though this follows a break job.

It could be that you had a bad master or booster and the brakes were not properly bled after their replacement. This could seem like the same problem but with different sources.

This may seem obvious to some to bleed the system after any work but even if you did this already you should do it again. Bleeding air from the master all the way to the rear cylinders takes quite a bit of time.

Hope this helps but if not please let me know the answers to the questions at the top.

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