Chris64
Junior Member
- Joined
- Sep 16, 2024
- Posts
- 20
- Reaction score
- 39
- Location
- San Diego
- First Name
- Chris
- Truck Year
- 1974
- Truck Model
- K20
- Engine Size
- 350
74 k20. I'm new to these things aside from dirt bikes and quads.
I don't know if the rear brakes were working before but the pedal was mushy. I bled the front brakes fine (ish).
When I went to bleed the rear left the vacuum wasn't pulling any fluid at all. The bleeder screw was cleaned out before trying. So I tried the old pedal pump method and that seemed to work.
I was afraid I messed up the proportioning valve but I'm assuming that this was not the case if the rear left was working.
It still seems odd that it worked pumping but not vacuuming. No biggie. Got a few bubbles out and topped off the reservoir.
On to the right side rear. Cleaned out the bleeder screw (brake cleaner, small wire). Note: neither side leaked fluid with the bleeder screw removed. Maybe that's normal for rear brakes.
The vacuum wasn't pulling anything so I tried the pedal and nothing was going to that drum at all from the pedal.
I have the proportioning valve that has the little reset button for the front (I believe).
Any thoughts of how I should diagnose this? It almost seems like that line from the split on the axle is clogged because I could pump fluid through the rear left. That said the brakes on the rear are not working at all.
Also when pumping the brakes we do this with the motor off. I'm assuming that's correct.
I don't know if the rear brakes were working before but the pedal was mushy. I bled the front brakes fine (ish).
When I went to bleed the rear left the vacuum wasn't pulling any fluid at all. The bleeder screw was cleaned out before trying. So I tried the old pedal pump method and that seemed to work.
I was afraid I messed up the proportioning valve but I'm assuming that this was not the case if the rear left was working.
It still seems odd that it worked pumping but not vacuuming. No biggie. Got a few bubbles out and topped off the reservoir.
On to the right side rear. Cleaned out the bleeder screw (brake cleaner, small wire). Note: neither side leaked fluid with the bleeder screw removed. Maybe that's normal for rear brakes.
The vacuum wasn't pulling anything so I tried the pedal and nothing was going to that drum at all from the pedal.
I have the proportioning valve that has the little reset button for the front (I believe).
Any thoughts of how I should diagnose this? It almost seems like that line from the split on the axle is clogged because I could pump fluid through the rear left. That said the brakes on the rear are not working at all.
Also when pumping the brakes we do this with the motor off. I'm assuming that's correct.
. The nice thing with this truck is I really don't even have to remove the tire to bleed it. It's pretty easy to access from the back.
