The Problem Started After replacing brake pads.Now the Brake pedal just falls to the floor.

The pedal is very loose and has no pressure.

As per the problem,it clears that problem is with master cylinder or brake calipers.

But before we assume either caliper or master cylinder damage, we need to do a couple of basic checks.

This basic inspection test will help to confirm the exact cause of problem.
For this test / inspection procedure.
Pull the wheels, check that the brake hoses are not twisted. If ok, check that the pads are seated flush and engage the rotors flushly when someone pushes the brake pedal. If ok, check the calipers are not bolted up cocked at an angle.

But if all basic possibilities are getting checked ok, then you have to do a brake line clamp test. Use vise grips to lightly clamp in place about halfway up all the flexible brake hoses. Check the brake pedal. It should be firm. If not, then when you pushed the calipers in the master cylinder got damaged by the force of the backpressure or from sediment being pushed up into it. Replace the master cylinder.

If pedal is firm, then remove one clamp at a time and retest pedal. At whichever wheel you remove the clamp and brake pedal drops, that is the one that caliper is bad and needs to be replaced.

This tests and details will help.
Thanks.

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The Problem Noticed on Pontiac Grand AM.

The brake is having pressure when engine is off,but when engine is on brake has no pressure at all.

On basic of this the details to troubleshoot this problem is as follows :----

First try this basic possibilities before confirming any part problem.

Bleed brakes and see if there is full pressure while engine is off .If yes then the master cylinder is working. Once there is no more air in the lines turn engine on and try to apply the brakes.Do you have zero pressure to the floor.OR is braking properly for a while.
Basically Pressure builds as you pump brakes while engine running, but if you notice engine stalling while holding brakes, throttled slightly to keep engine running . Check all brake lines for any air/ fluid leaks.

If its not helping then read further

If you have a good solid brake pedal with the engine off, but the pedal drops out with the engine running then you definitely have a bad brake booster. The engine stalling is also a symptom of a bad booster, due to a large vacuum leak.

The master cylinder is okay if it builds pressure with the engine off. When you remove the master cylinder to replace the booster, make sure you check to see if there is any leakage from the back of the master cylinder. If there is leakage you will have to replace the master cylinder too.

This details will help.
Thanks.

schematics and diagrams

@

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NO Brake Pressure?

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