Help with braking shakes

[MEMO43]

Ok rig is an 85 Chevy k20, I have developed a shaking/pulling when the brakes are applied. Almost as if I have a warped rotor?
Not sure if it could be the MC or proportion valve.
Everything else has been replaced last Aug.
I replaced wheel bearings, calipers, rubber hoses, rotors, brake pads.
For the rear I replaced the rubber brake line, wheel cylinders and brake drums and hardware and new shoes.
Front suspension is new as well, The reason I did all this when I first got the truck it sat parked for over 5 years due to bad ball joints on the passenger side.
I still have the original MC, proportioning valve and that weird load sensing valve out back.
I've done manual brake bleeding, vacuum bleeding and finally got the kit to that pushes fluid through the MC out the bleeder screw.
Also to replaced all shocks due to one of them have developed a leak, went with Bilstein's.

Can a failing MC cause the shake/pulling or the proportioning valve
This one has me baffled.

 

[Wes Harden]

Do you feel it in the seat of your pants, or the steering wheel?

Go jack up the front and check the bearings for play. Recheck wheel lug nut torque.

Mc is probably not the cause.
Warped rotor, stuck caliper, egg shaped drum, or hard spots

 

[MEMO43]

Wes I feel it more at the seat of the pants, very little at the wheel.
I'm taking a week off from work an have planned on rechecking everything as well as to address a pesky oil leak at the manifold.
But ill definitely check the bearing for play, I would be surprised if they were bad, good thing for lifetime warranty from the local orilieys

 

[Wes Harden]

Yeah just a precaution to recheck the work you did earlier.

It is probably going to be rear drums. Since it felt in seat. Out of round,hot spotsor contamination from gear oil or brake fluid.

When to investigate post some pictures of drums and brakes.

 

[TJ1978]

have Napa turn them..
I bought some new drums for an old c10 and they weren't round...one was pretty egg shaped

 

[MEMO43]

Yeah just a precaution to recheck the work you did earlier.

It is probably going to be rear drums. Since it felt in seat. Out of round,hot spotsor contamination from gear oil or brake fluid.

When to investigate post some pictures of drums and brakes.

I will recheck everything again.
Just sometimes find it frustrating when new parts fail or wear out.
But I will do my due diligence and check everything over as well post pictures.
But now that i think of it I feel it more at the wheel, especially since it wants to pull right.

 

[Wes Harden]

The right pull could still be rear brakes.

How about the brake pedal does it pulsate?

 

[MEMO43]

No pulsating at all, I will go over everything again,
I'm sure it is something that I must be overlooking, "hopefully"
Just find it odd that the shakes appeared a few months after i did all the work,
But by the time I'm done I will know its right

 

[Wes Harden]

---

Yes confident you are looking at rear brakes as the problem.
Setting the p brake hard after a long hot braking event is a common drum warping cause.

 

[Chickntrk]

I feel your pain, I went through 2 master cylinders before I got a good one, and I bought new and not reman…..then I got new calipers and got someone else’s returned cores…I agree with Wes, I’d say the rears are the issue, I don’t see how a bad master could cause those issues

 

[MEMO43]

Looks like I'll have to do my research as far as setting the drag and e brake on rear drums.
Good thing they are new and only weight like 100 lbs each, the beauty of rear drums.
I appreciate the feed back if i could offer you both a beer in person I would
But my truck has a gas drinking problem