Topic: Double pump

[Auggydog]

Hi there,

In running 80 front brakes,rear are cadilak rotors with 1/2ton chevy rotors..
Master is 89 7/8" master. 

Have to double pump to stop,scary rolling backwards.Taking wife on first wheeling trip with Marlin.Need help figuring this one out.

Thanks from the wife!!!

[SqWADoosh]

Have you started by checking for any leaks in the brake system and bleeding it?

[BoG-ToY]

Are all your bearings in great condition as well...

[Auggydog [OP]]

I have good peddle after a couple pumps,no air in lines when bled them last time.

What would bearings hav to do with the problems?

Have heard I might need a residual pressure valve.Don't know what it is or does.

[Mudder]

Are you running a single or dual diaphragm brake booster?

[:)bestgen4runner]

How recent is the new master cyl.
there is a bench bleeding process of the master cyl. prior to install.
if this process is not done it can be impossible to bleed out the air trapped in the master cyl. 

[mudmaster]

Have heard I might need a residual pressure valve.Don't know what it is or does.

It holds a small about of pressure on the brakes to prevent the caliper pistons from retracting too far, thus preventing more pedal travel.

[Mudder]

I'm wondering if the 7/8's MC is to small. What exactly is your front brake set up? Rotors, and callipers?

[mudmaster]

I have an FJ80 MC, with IFS caliper and rotors (don't remember the years).

[mudmaster]

I got my residual valve at Summit Racing. It's plumbed into the rear brakes.