Conversion to disc in rear

2003 Toyota Tacoma prerunner: upgraded the calipers( high heat), rotors ( for towing) supposedly will cool faster. Had the drums replaced, ans well ans everything else in the rear brakes. Also the suspension front and rear. I still cannot go downhill without partially losing brakes. I will have to stop multiple times heading downhill. Will the conversion actually help slow my vehicle?

 

Gear down and go slower!

 

Need to use engine braking more, shouldn’t ever overheat brakes.

 

Define “losing brake” and what type of grade are you talking about?

 

What kind of brake fluid are you running? That can easily be a weak point in any braking system. A good DOT 4 should be plenty for these trucks.

Some also upgrade to Tundra brakes for more thermal capacity.

As other’s said, you may need to adjust your driving habits or your load if you’re still having issues.

 

Do you have a manual transmission?

Is your brake proportioning valve (rear axle) functioning correctly? It sends more pressure to the back axle when weight in the bed or on the hitch. AND if the rear suspension is lifted above stock, it needs a relocation bracket soit doesn't behave as if the truck is empty.

How heavy is your trailer and do you have brakes on it?

 

Scary stuff isnt it? Scocar is spot on. I have a 99 Ram 2500 4X4 Automatic with the Cummins motor. I tow a 33' 5th wheel toy hauler and it was the exact same situation. The fix was to take the rear brake proportioning valve out completly, there is a service bulletin for that truck. There just isnt enough weight on the bed to compress the rear spring enough to open the LSPV (load sensing proportional valve) fully. The downside to this "fix" is that the rear brakes will lock up when not towing so the brakes have to be applied easier.

There is a post in this forum where this is discussed "LSPV delete correct return line" is the title.