Problem bleeding brakes - any pointers out there?? - Page 2

retnug · 07-09-2003, 01:35 PM

It could be that the pistons on the calipers are not the proper distance from the pads. If they are not set to the back of the pad it would take a couple pumps to get then to the point where they actually move the pads to contact the rotor. When you let off the brake there is enough suction to pull the pistons away from the pads again. There are a few things you can do.

You can take the wheel off, pull the pads out and put something ( I use a small block of wood) that is a little thinner than the pads and press the brake pedal. You need the block so the pistons don't come out of the calipers. Also try different size blocks until you can barely insert the pads. If you go to narrow and can't get the pads in you will need to force the pistons back into the caliper a little. ( I have used a c-clamp). Then check the fluid and move on to the next wheel. This procedure solved my problem when I did my brake rebuild last year.

The other way I was told to fix it was to just drive carefully and they would slowly adjust themselves. I wasn't comfortable with the spongy brakes so I opted for the first solution.

Good luck.

Of course this is provided that you think you have removed all the air from the system as the others have stated.

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Gunter
'82 SC Targa

ZCAT3 · 07-09-2003, 03:54 PM

It could also be that your other car is a 993TT - the brakes in that car will make just about any other brakes feel a bit off.

speeder · speeder's Garage

ZCAT, That is true, those 993tt's stop just short of doing reverse wheelies,

, but Rob has had enough early cars to know what to expect, also.

rlane · 07-10-2003, 07:08 AM

I went thru this (multiple quarts of fluid) with a buddys 71 911T afetr we installed SS lines. We finally traced it to a MC issue, I believe there have been a number of threads on this but if I recall it is an issue of the piston in the MC going to far and a seal getting deformed/?reversed?? Somebody with more technological expewrtise chime in.

speeder · speeder's Garage

Richard, that is certainly one possible explanation, and these discussions apply to any car, nothing at all unique about the 911's brake system.

My point before was that if it takes 12 quarts

of brake fluid to bleed a car, it might as well take 20 gallons. Something is not right, the time to investigate is when the first quart doesn't do it.

rlane · 07-10-2003, 01:54 PM

Exactly Denis..but then again we wouldn't be male if we didn't beleiev we could get ourselves "unlost" by just driving on a bit...or trying just one more bleed sequence........ I think it only took Tom and I 4 qts to realize our issue was elsewhere...but we have both been married awhile.....