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Brake Nightmare - Is it the powerbooster ???


FSchuett

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Hello all,

I´ve the same problem since mai 2010 with my ´95 Eldorado brakes.

For example, I´m driving with 50 mls/h and press powerfull

the brake pedal... The ABS are not working because the wheels

are not blocking and the pedal is down to the floor.

If I drive in snow or mud, the ABS works fine because the wheels blocking.

Now, I think the brakes must brake better...

If I press the pedal with many power it goes slow to the floor.

I think it´s not normal, because I can not blocking the wheels at normal

dry street.

We have change the following parts in a Cadillac repairstation:

- All brake lines and linen

- All rotors with pads

- Valve pressure modul

- brake master cylinder (first a "no name" than orig. AC Delco)

- Correct bleeding from Cadillac service

- Nothing leaking

Cadillac Germany say, that the brakes are very bad, but they don´t know why !

They mean the brake booster is the last part which we not change...

At the brake testing the brake are in the front with 370 daN...

Anyone an idea ?

Is it the brake booster ?

Frank

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Please begin by reading your OBD codes and posting them here. You can get the instructions on how to do this from your A/C controls from the link in my signature block.

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-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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Please begin by reading your OBD codes and posting them here. You can get the instructions on how to do this from your A/C controls from the link in my signature block.

Hello,

I don´t have any OBD codes - nothing...

Frank

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If you bleed the vacuum off the brakes by pressing and releasing the brake pedal with the engine off, do you have a solid pedal feel or does the pedal slowly sink to the floor?

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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If you bleed the vacuum off the brakes by pressing and releasing the brake pedal with the engine off, do you have a solid pedal feel or does the pedal slowly sink to the floor?

The bleeding procedure was making from Cadillac in Germany

with TECH2 and Cadillac instructions.

Frank

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Frank, I was referring to you sitting in the driver's seat with the engine off and pressing and releasing the brake pedal until there is no vaccum assist to the brake pedal. Then apply the brakes - is the pedal firm or does it fall slowly to the floor.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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Frank, I was referring to you sitting in the driver's seat with the engine off and pressing and releasing the brake pedal until there is no vaccum assist to the brake pedal. Then apply the brakes - is the pedal firm or does it fall slowly to the floor.

Hi Kevin,

the pedal is firm...

also I start the engine the pedal go unter pressure slow to the floor...

Frank

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Hi Kevin,

the pedal is firm...

also I start the engine the pedal go unter pressure slow to the floor...

Frank

OK thanks for the information. Just to confirm, with the engine off and no vacuum in the system, the brake pedal is firm and it does not drop to the floor, correct?

If so, I am starting to wonder if you don't have an issue with a rubber brake line ballooning up when the brakes are applied. Another possibility is the rear brakes are not performing their share of the braking activity due to a misadjusted parking brake? Just some thoughts.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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I would also check to make sure front caliper pins are not seized. If you have not replaced the calipers it may be that there is rust underneath the rubber bushings which is causing the pins to seize.

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Sounds like the master cylinder is leaking internally but it doesn't show until enough force is applied (booster pressure)

We have install second mastercylinder in 2 month...

Today its a new original AC Delco from Cadillac installed...

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I would also check to make sure front caliper pins are not ceased. If you have not replaced the calipers it may be that there is rust underneath the rubber bushings which is causing the pins to cease.

I don't know what you mean with "are not ceased" ?

Can you exact comment me this problem with the pins ?

Thats maybe the solution of a mystery...

Because the brake problem are after brake pad and rotor exchange stronger than before.

Curious is, that Cadillac Germany can find the problem and installed all brake parts in my Eldo...

i think Cadillac to know which side one's bread is buttered on...

Frank

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I would also check to make sure front caliper pins are not ceased. If you have not replaced the calipers it may be that there is rust underneath the rubber bushings which is causing the pins to cease.

I don't know what you mean with "are not ceased" ?

Can you exact comment me this problem with the pins ?

Thats maybe the solution of a mystery...

Because the brake problem are after brake pad and rotor exchange stronger than before.

Curious is, that Cadillac Germany can find the problem and installed all brake parts in my Eldo...

i think Cadillac to know which side one's bread is buttered on...

Frank

Please excuse me...I am not trying to be the spell check police...

but I think MAC meant "SEIZED" and "SEIZE"...not "CEASED" and "CEASE"...

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[quote name='Texas Jim' date='14 October 2010 - 07:24 PM' timestamp='1287098698'

Please excuse me...I am not trying to be the spell check police...

but I think MAC meant "SEIZED" and "SEIZE"...not "CEASED" and "CEASE"...

Thanks Jim!

I know the word is spelled "seized", but my brain didn't note the spelling errors. :blink: WOW!

Sorry for the confusion. I corrected the spelling errors (albeit late).

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I would also check to make sure front caliper pins are not ceased. If you have not replaced the calipers it may be that there is rust underneath the rubber bushings which is causing the pins to cease.

I don't know what you mean with "are not ceased" ?

Can you exact comment me this problem with the pins ?

Thats maybe the solution of a mystery...

Because the brake problem are after brake pad and rotor exchange stronger than before.

Curious is, that Cadillac Germany can find the problem and installed all brake parts in my Eldo...

i think Cadillac to know which side one's bread is buttered on...

Frank

If you take the front brake calipers off the caliper sliders should move easily within the rubber bushings. If not, then chances are there is rust underneath the bushings causing them to press against the slider, which in turn will not allow the calipers to adjust and brake correctly. If you have to hit them with a screwdriver or some object and a hammer to make them move then you should remove the bushings (if possible) or replace them after removing the rust or replace the calipers.

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