So I went to the track for the first time ever, pretty nervous. The second time I run, I get through the end and going up on the bank I realize my power brakes are gone. I've got a 6 month old brake booster. Get back, check everything. Master cylinder is fine, no losing any brake fluid, BRAKE BOOSTER. It's out I guess, what else could it be? Also, last time it when out, I was getting on it. What causes that crap? I don't understand how ragging on it makes the brakes go out, just boggles my mind. I'm so pissed I'm rambling. Any advice is greatly appreciated, what am I doing wrong?
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1998 Mustang GT-SVO Headers-Steeda Tri-Ax-Flowmaster American Thunder Mufflers Dumped-Eibach Springs-Edelbrock Shocks-Tokico Struts-MM CC Plates-CAI
Im gonna bet that its some kind of vacume issue. Why??? Usually whan there is agressive driving, it can put stress on many of the cars componets, such as ps, a/c, motor mounts etc, including vacume lines.
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2001 Mustang GT-"GONE"
Bassani x-pipe Catted, Flowmasters, CAI, March UDPs, Steeda Tri-ax, Functional Hood scoop, Matrix lowering springs, Steeda C/C plates, Roush LCA, Alpine-9885 Head Unit.
2003 F150 Sport 4X4 4.6-SOLD
1999 F150 Xlt Flaresode 4.6-SOLD
Maybe the check valve on the booster is bad. Cause if you're going down the track at WOT, there's no vacuum to build up. Does the booster hold vacuum after you shut the car off? You should be able to get a few "powered" applications after you shut of the engine.
If the boosters keep breaking, maybe the master is leaking into the booster. It's been known to happen.
I'll drive with broken power steering, but not with an unworking power brake booster.
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1992 Deep Emerald Green Mustang GT Hatch, 5 speed, 2.73s, Mac fenderwell cold air intake, '93 Cobra MAF, Mac 70mm throttle body & spacer, Explorer intakes, Mac unequal headers & offroad pipe, Magnaflow catback, Walbro 110lph fuel pump, Jet adjustable FPR, MSD Blaster coil, Accel 8mm wires, FRPP aluminum quadrant, UPR firewall adjuster, stock cable, Granatelli upper control arms.
Waiting to go on: Granatelli lower control arms, and GT40 Iron heads!
Dragracing Troubles 
