As the title states: what is the difference between a FZJ80 master cylinder and a 90's 4runner 1" master cylinder?
The reason why I ask the question is that I recently swapped my '86 Pickup rear axle (drum brakes & 15/16 wheel cyl) for a disc brake '96 FZJ80 rear axle. The truck currently runs a 90's Cab and Chassis Pickup 1" master and dual diaphragm booster off a u-haul truck. The brakes felt great with the old drums and feel good now. As I tune the brakes, I want to ensure that there isn't something mechanical I am overlooking (such as the wrong residual valve in a master cyl).
What I have noticed is these issues:
While I tune the brakes, I want to make sure the internals of the drum brake and the disc brake master cylinders are the same. Can anyone confirm this for me? Is there a residual valve in the master cylinder? I did a bit of research and found that the 4runner and the non-abs fzj80 use the same master cylinder in the aftermarket. But that doesn't mean they are the same from Toyota.
Thanks for your help.
The reason why I ask the question is that I recently swapped my '86 Pickup rear axle (drum brakes & 15/16 wheel cyl) for a disc brake '96 FZJ80 rear axle. The truck currently runs a 90's Cab and Chassis Pickup 1" master and dual diaphragm booster off a u-haul truck. The brakes felt great with the old drums and feel good now. As I tune the brakes, I want to ensure that there isn't something mechanical I am overlooking (such as the wrong residual valve in a master cyl).
What I have noticed is these issues:
- The pedal feel is great when driving, but when I hit the brakes hard, I can get the pedal to the floor
- When pumping the brakes, the engine starts to stumble (WD40 in the brake booster check valve fixed 80% of this issue)
- The brakes were very mushy when the proportioning valve was set for drum brakes. Then as I reduced the pressure to the rear calipers, the pedal became stiffer.
While I tune the brakes, I want to make sure the internals of the drum brake and the disc brake master cylinders are the same. Can anyone confirm this for me? Is there a residual valve in the master cylinder? I did a bit of research and found that the 4runner and the non-abs fzj80 use the same master cylinder in the aftermarket. But that doesn't mean they are the same from Toyota.
Thanks for your help.