rear brakes not working.. need help

[kammi10]

alright so i have had this problem since last fall and am just getting around to fixing it since summer is just around the corner. the rear brakes just barely seem to engage at all.

brake system consists of stock master, ssbc adjustable prop valve, aero space street brakes up front with wilwood drag rear discs. has 3/16's lines to both fronts with 1/4 inch out back and split into two 3/16ths to each side.

i have pumped and bled both sides and am not getting any major pressure like it should. you can feel the rear calipers clamp down a little but not enough that you can not still move the rotor by hand.

fronts clamp down great but the rears do not.

any idea's?

[sman]

My first instinct would say the prop valve needs to be adjusted. 1/4 seems like plenty of line to run the backs.

[hoogiesngrinderz]

My guess is a bad pressure seal for the rear portion of the MC.

[kammi10]

My first instinct would say the prop valve needs to be adjusted. 1/4 seems like plenty of line to run the backs.

ive tried the adjustable in 5 different places with the same results

[Fox Slaughter]

Well turning the rotor is a problem but remember the backs are only supplement to front brakes. Front brakes do most of the work, but you shouldn't be able to turn the rotor. When bleeding you bled the farthest first correct? So Passenger Rear, Driver Rear, Passenger Front, Driver Front.

[SS4Matt]

Well turning the rotor is a problem but remember the backs are only supplement to front brakes. Front brakes do most of the work, but you shouldn't be able to turn the rotor. When bleeding you bled the farthest first correct? So Passenger Rear, Driver Rear, Passenger Front, Driver Front.

well it's kindof 100% opposite on a turbo drag car. you need those rear brakes to hold on for dear life while you foot brake the car into the staging lights before you plop the trans brake button. (thus why aerospace, and i'm sure others, make dual rear caliper kits to hold the car while you're brake boosting it up)

as for why thy ninja rears don't work....I dunno

[Gaspo]

i agree with Michael. or maybe it could just be a faulty proportioning valve?

[Fox Slaughter]

well it's kindof 100% opposite on a turbo drag car. you need those rear brakes to hold on for dear life while you foot brake the car into the staging lights before you plop the trans brake button. (thus why aerospace, and i'm sure others, make dual rear caliper kits to hold the car while you're brake boosting it up)

as for why thy ninja rears don't work....I dunno

Now is that for auto and manual? How exactly do you built boost, while staging. I know being in neutral won't you need load on the engine. Do you put it in gear, hold the brake and just start revving and it will build boost?

[Fbomb]

Now is that for auto and manual? How exactly do you built boost, while staging. I know being in neutral won't you need load on the engine. Do you put it in gear, hold the brake and just start revving and it will build boost?

Auto, stalling up the converter against the brakes...or popping off of a 2-step dipping fuel

[Fox Slaughter]

Auto, stalling up the converter against the brakes...or popping off of a 2-step dipping fuel

How would you do it on a manual?

Sorry about the /Thread Jack

[kammi10]

well it's kindof 100% opposite on a turbo drag car. you need those rear brakes to hold on for dear life while you foot brake the car into the staging lights before you plop the trans brake button. (thus why aerospace, and i'm sure others, make dual rear caliper kits to hold the car while you're brake boosting it up)

as for why thy ninja rears don't work....I dunno

fact.. i just got off the phone with jeff and he said its normal for it to do that until i can start the car and let it run and build a good amount of vacuum.. so we try that next

[SS4Matt]

Now is that for auto and manual? How exactly do you built boost, while staging. I know being in neutral won't you need load on the engine. Do you put it in gear, hold the brake and just start revving and it will build boost?

Auto. Yes while in 1st you literally brake torque the car. you will use your gas pedal to "push" the car through the brakes to hit the second stage bulb and then hit the trans brake and let off the foot brake

Auto, stalling up the converter against the brakes...or popping off of a 2-step dipping fuel

you need to build some boost before/as you light up the first stage bulb. as soon as the second stage bulb lights off you grab the trans brake and put your go pedal to the floor boards! Two step is wired onto the trans brake switch, so the two step will not turn on until you're on the Trans brake!

How would you do it on a manual?

Sorry about the /Thread Jack

I'm not sure why people "drag race" a manual, other than just to prove a point. I think those peeps just use a two step and hope it comes up fast enough?