C1500 Brake help

[alex s]

Do those old trucks have a proportioning valve along the frame? I had one of those go bad once in a G-Body car.

The proportion valve is up near the MC, with a "T" near the frame

 

[swathdiver]

The proportion valve is up near the MC, with a "T" near the frame

Is it in top form? Does yours have rear ABS? I went through six quarts of brake fluid to drain and bleed mine both manually and with the Tech-2 for the ABS system.

 

[96-2D-Hoe]

the pedal keeps traveling slowly.

You need to replace the MC again

 

[OR VietVet]

You need to replace the MC again

I would listen to @96-2D-Hoe about the master cylinder. If there is one thing he knows about, it is master cylinders.

 

[alex s]

You need to replace the MC again

I will be replacing it again tomorrow. This time I will bleed it without fully pressing and see what happens.

 

[96-2D-Hoe]

Fill it up from dry and leave it for 10 mins before you start plunging.

Tilt it forward and plunge and tilt is backward and plunge it too.

Also Bleed any air from the blanking plugs, crack one open a little, plunge the mc and close the plug before you let off the plunge

 

[kbuskill]

Put a MC off of a GMT800 truck and forget about spongy pedals. It only requires one adapter fitting to install it on your GMT400 truck.

I did this along with 1 ton rear wheel cylinders on my 1st gen Esky and it made a big difference.

Those trucks always had a soft spongy pedal.

The biggest issue I had was my rear brakes not staying in adjustment no matter what I did. I changed ALL the hardware inside the shoes several times and they still wouldn't stay adjusted without having to backup and hit the brakes, to self adjust, every couple days.

If I would have kept the truck I was going to convert the rear to disk brakes.

 

[96-2D-Hoe]

A lot of people are not happy with this swap. It seems likely the ones that are needed a new MC anyway.

 

[kbuskill]

A lot of people are not happy with this swap. It seems likely the ones that are needed a new MC anyway.

I can't imagine why they wouldn't be happy... it made a very noticeable improvement on my Esky. I swapped over just for the upgrade, my old MC was fine.

 

[96-2D-Hoe]

Because it's not designed for the 400 and the 800's have a different brake set up.

People say they get a better pedal feel but less brake force.