[B3 Coupe Quattro 7A] problem with brakes....

bobo23 · Post autor: **bobo23** » 09 sie 2015, 19:43

Hi guys, please, i change front brake lines,hoses (for Goodridge), discs , pads (Hawk hp+) and 4 piston brembo calipers (all in front). And bleed it with "one man push , second bleed " and when i get my car from the garage, i noticed that brake pedal goes too low when it starts braking and very easy...I expect that the brake power will be huge (as one member said and he have the same spec on audifans.net) Do you think, that it will be just badly bleede?Or brake master cylinder is too weak or? I am so sad from it. Its on my Audi Coupe Quattro 20V

So resume (New brake lines front + rear)

Front 4 piston Brembos + 324mm discs + Hawk hp+ + pads + Goodridge + EBC 307+ fluid
Rear Oem calipers + OEM discs + EBC yellow stuff + Goodridge + EBC 307+ fluid

maciek889 · Post autor: **maciek889** » 09 sie 2015, 21:47

One guy on these forum had similar problem after callipers change (even for smaller calipers than yours). He changed master cylinder and it solve his problem. He mounted master cylinder from Audi A4 but not remember is it from B5 or B6. Maybe he mounted A4 break servo too. I try find it layer.

bobo23 · Post autor: **bobo23** » 10 sie 2015, 10:44

maciek889 please, find it, if you can. Thank you a lot

bloku · Post autor: **bloku** » 10 sie 2015, 13:59

If You change only brakes without hydraulic pump to servo it maybe some problems. EDD installed brakes from Porsche and also had soft and low pedal. He change servo to 10inch from Audi A6/A8 and the problem disappeared.

Also worth checking out the pin (indentation of it) which are conected with pedal box. Maybe gap between is too small and power are so strong for Yours brake caliper?

bobo23 · Post autor: **bobo23** » 18 sie 2015, 21:30

A6/A8 ? Which year or model? Thank you

bloku · Post autor: **bloku** » 18 sie 2015, 21:37

A8 D2 (4D) 3,7-4,2 engines.

bobo23 · Post autor: **bobo23** » 22 sie 2015, 17:19

please any ideas where is good to buy a new brake master cylinder on 7A ? Because when we bleed the brake master cylinder, every push goes a air and foam...so inside the master cylinder get somewhere air in, because of a years and maybe the surface inside are grinded, so an air goes through master cylinder and we cant bleed it...