Single diaphragm brake booster
Posted: Sun Nov 03, 2013 7:13 am
The changes this mod made were very interesting, and very positive.
Wheel and Brake setup:
Bridgestone Pole Position S04
RS 6 Spokes
FHI 4/2 pot 06 WRX calipers
Carbotech AX6 Pads
FHI 06 WRX rotors
StopTech Stainless Steel Lines
96' Impreza L ABS single stage booster.
Legacy SS stock master cylinder.
I liked the carbotechs when I installed them. They are a very grippy pad when bedded properly. But weeks after the install I was still having issues modulating pressure once I got them warmed up. It seemed like the kink point where more pressure equaled much more stopping was just around where the stock dual stage master changed modes.
This mod completely alleviated this problem. I mean gone, terminated, neck snapped IN HALF! The brakes feel just like how I want them to. Beautifully linear, not too much pedal travel to screw up downshifting. Downshifting while braking before was extremely tricky with sticky pads. Too much travel and too big of consequences for not keeping consistent pedal pressure.
I just have to recommend the list of brake mods I have done. It has completely woken this aspect of the car up. When you want to loose speed, you dump speed. It's incredibly easy to slow down too much. It makes it very tempting and possible to dive deep into corners with braking. I am done with modding the brakes for a long time. If I have heat problems I will go to DBA 5000 series rotors. I may add a driver controlled proportioning valve in the future.
The only downside has been the temperament of the pads. They need to be used hot every couple days. Prolonged cold braking will wear away the material off the rotor. This makes them squeal bad. If you really have to get on the brakes, ear splitting bad. But if you maintain a coating of friction material on the rotors they stay mostly quiet, maybe some squeaking when it is cold out, but easy to ignore.
-----------------------------
The Install.
I read a write up from an impreza forum the night before... while drunk. The author made this out to be some kind of big deal. Not really.
It requires a lot of brackets being loosened to move hoses and wires clear. I loosened my clutch mater cylinder to remove the booster, it was stuck until I did this. I wish I had started by doing this instead of trying to wrestle it out.
Installation really is the reverse of removal. Just a lot of step 1, step 2, step 3 stuff all around.
I recommend using the ATE super blue / type 200 fluids. One is blue, the other is gold, they both have the same properties. This allows you to see when you have completely flushed a system. Very useful for when your fluid is new and you want to make sure that you have completely bled out a line from the master cylinder down.
Wheel and Brake setup:
Bridgestone Pole Position S04
RS 6 Spokes
FHI 4/2 pot 06 WRX calipers
Carbotech AX6 Pads
FHI 06 WRX rotors
StopTech Stainless Steel Lines
96' Impreza L ABS single stage booster.
Legacy SS stock master cylinder.
I liked the carbotechs when I installed them. They are a very grippy pad when bedded properly. But weeks after the install I was still having issues modulating pressure once I got them warmed up. It seemed like the kink point where more pressure equaled much more stopping was just around where the stock dual stage master changed modes.
This mod completely alleviated this problem. I mean gone, terminated, neck snapped IN HALF! The brakes feel just like how I want them to. Beautifully linear, not too much pedal travel to screw up downshifting. Downshifting while braking before was extremely tricky with sticky pads. Too much travel and too big of consequences for not keeping consistent pedal pressure.
I just have to recommend the list of brake mods I have done. It has completely woken this aspect of the car up. When you want to loose speed, you dump speed. It's incredibly easy to slow down too much. It makes it very tempting and possible to dive deep into corners with braking. I am done with modding the brakes for a long time. If I have heat problems I will go to DBA 5000 series rotors. I may add a driver controlled proportioning valve in the future.
The only downside has been the temperament of the pads. They need to be used hot every couple days. Prolonged cold braking will wear away the material off the rotor. This makes them squeal bad. If you really have to get on the brakes, ear splitting bad. But if you maintain a coating of friction material on the rotors they stay mostly quiet, maybe some squeaking when it is cold out, but easy to ignore.
-----------------------------
The Install.
I read a write up from an impreza forum the night before... while drunk. The author made this out to be some kind of big deal. Not really.
It requires a lot of brackets being loosened to move hoses and wires clear. I loosened my clutch mater cylinder to remove the booster, it was stuck until I did this. I wish I had started by doing this instead of trying to wrestle it out.
Installation really is the reverse of removal. Just a lot of step 1, step 2, step 3 stuff all around.
I recommend using the ATE super blue / type 200 fluids. One is blue, the other is gold, they both have the same properties. This allows you to see when you have completely flushed a system. Very useful for when your fluid is new and you want to make sure that you have completely bled out a line from the master cylinder down.