Okay, so here's the deal. I'll be driving around, come up to say, a yellow light, push in the clutch and casually apply the brakes. Nothing extreme, just touch the brake pedal. Rear wheels lock up completly. If I leave the clutch engaged, you can feel the truck brake HARD, but won't lock up since I have a lockright in the back.
On quick inspection, it could be the LSPV since I have the arm tied up to max.
BUT, this only happens every so often. Especially when it rains. Must be the moisture.
It rained this morning and dried up during the day and was able to lock up my rear wheels on dry pavement. Pretty impressive for some crappy drum brakes to lock up 35s. I literally pushed the brake pedal in like half an inch. As soon as I felt and heard the wheels lock up a let off and touched the pedal and locked up again. Basically, as soon as the pedal got through the freeplay, the wheels locked up.
My truck: 1983 Pickup, with 35x12.50 tires and a rear Lockright.
My brake system consists of:
1" master off a 4runner
Stock 83 booster (brakes are harder to apply than stock because of the large master)
Front calipers are off a V6 truck and have the large 4 pistons.
Vented rotors off a FJ40
LSPV with arm cut and tied to max (started leaking so I cut it and moved it up, arm didnt reach with the lift anyways)
Stock rear brake drums, probobly packed with mud, newish shoes, probobly toast by now.
I have a few theories:
The rear LSPV was leaking, so it could be plugged for most of the time. Becomes unplugged and the wheels lock up. Possible due too the moisture.
Front calipers could be plugged, too hard to move the pistons. Fluid takes the path of least resistance and locks up the rear. I got these calipers used for 50 bucks off a early 90s runner. They work great. My pedal was spongy with the stock master, so I upgraded to a 1".
Master cylinder might be plugged alowing more pressure to the rear brakes. But it has done this with the old master as well.
Gremlins?
Anyways, this whole thing makes NO sence. My brakes should be hard to use with the stock booster and 1" master. Usually they are hard to use.
Sorry for the loooong post, just wanted to get it all in there.
On quick inspection, it could be the LSPV since I have the arm tied up to max.
BUT, this only happens every so often. Especially when it rains. Must be the moisture.
It rained this morning and dried up during the day and was able to lock up my rear wheels on dry pavement. Pretty impressive for some crappy drum brakes to lock up 35s. I literally pushed the brake pedal in like half an inch. As soon as I felt and heard the wheels lock up a let off and touched the pedal and locked up again. Basically, as soon as the pedal got through the freeplay, the wheels locked up.
My truck: 1983 Pickup, with 35x12.50 tires and a rear Lockright.
My brake system consists of:
1" master off a 4runner
Stock 83 booster (brakes are harder to apply than stock because of the large master)
Front calipers are off a V6 truck and have the large 4 pistons.
Vented rotors off a FJ40
LSPV with arm cut and tied to max (started leaking so I cut it and moved it up, arm didnt reach with the lift anyways)
Stock rear brake drums, probobly packed with mud, newish shoes, probobly toast by now.
I have a few theories:
The rear LSPV was leaking, so it could be plugged for most of the time. Becomes unplugged and the wheels lock up. Possible due too the moisture.
Front calipers could be plugged, too hard to move the pistons. Fluid takes the path of least resistance and locks up the rear. I got these calipers used for 50 bucks off a early 90s runner. They work great. My pedal was spongy with the stock master, so I upgraded to a 1".
Master cylinder might be plugged alowing more pressure to the rear brakes. But it has done this with the old master as well.
Gremlins?
Anyways, this whole thing makes NO sence. My brakes should be hard to use with the stock booster and 1" master. Usually they are hard to use.
Sorry for the loooong post, just wanted to get it all in there.