Try this again ive searched all over since last i posted this question since i only got a hand ful of responses. Checked NW bombers, TDR and here as suggested quite a few people talk about it but no one seems to ever respond in detail about any issues. mostly its just comments about planning to do it or having an axle and considering the swap nothing factual so far.

Specifically if you have a 97,98, 99 or 2000 2500 or 3500 Diesel with hydroboost already and you swapped in a 01.5 or 02 rear Disk brake axle.

As i understand it the 99 and earlier have the single piston calipers front and drums rear the 2000 was the change over year with dual piston calipers front and drums rear and 01.5 brought in the dual piston calipers front and rear

By adding disks in the rear of a truck with the single piston caliper front setup was there an issue with unbalanced braking?

Did you have any issues with the master cylinder not being able to push enough fluid
did you have to upgrade.

Did you have to change proportioning valves.

The parking brake cable appears to mount and lock in the same place same way. Brake lines appear to be the same diameter.



Thanks




Search terms D80 : Dana80 : Dana70 : D70 : Rear Disc brake conversion : dana

 

Anyone????

 

It doesn't look like many people have done this specific swap? I'm somewhat surprised. Although I'm sure you have heard it all before, I'll give you my .02 anyway.

I have done and helped with several rear disc swaps for 3/4 and 1 ton axles and there has never been an issue with the master cylinder not being able to displace enough brake fluid. Bias is another story.....every vehicle seemed to react differently. Since the drum brake systems typically run a residual valve that allowed for 10 psi of residual pressure, we have found that to be too high for most disc brake systems.....too much bias to the rear and low pad life are the result. By removing the residual valve from the master for the rear brakes usually made the brakes work quite well, though, some people will tell you that you should have about 2 psi residual pressure for discs. On my Jeep, which runs 1 ton disc brakes front and rear, I also had to add an adjustable pressure limiting valve to reduce the peak pressure to the rear because the rear would lock up prematurely in a panic stop.

Hope this helps.....I know it wasn't what you were wanting to here.....hopefully someone who has done the swap will chime in........We know they are out there!

 

CTDNUT, Can you tell me where this "residual valve" is located, and what it looks like, and if my 95 has one, are they adjustable?
Thanks
Jim

 

I've done alot of swaps involving 4wheelers over the years and the proportioning valve issue is solved easily with a aftermarket adjustable valve. Also moving enough fluid is addressed by simple math. Compare the stroke and bore of your existing master cylinder with the vehicle you got the axle from. If you are moving more fluid with your master cylinder your brakes will not stop as well and less fluid they will be more touchy. I'd keep the residual valve but be carefull. If the new housing has smaller wheel cylinders, calipers etc the residual pressure will be too high and cause heat and premature wear on the brakes!