I recently rebuilt my brakes on a 77 F150 custom . New calipers, hoses, master cylinder, pads but the same rotors. I have noticed that the calipers are loose on the rotors and rattle when I am going over shaky ground. The brake light is on so I am wondering if the proportioning valve could be bad. I tried to the bleed the pv as I have read in some articles. I am thinking that these calipers should be exerting some pressure on the rotor even with out pedal pressure so the calipers remain tight.

Any help appreciated.

Thanks.

Jack

 

How loose is loose? Did you replace the key that you have to pound back in there? Also the bolt to hold in the key? The propor valve would have nothing to do with the rotors being loose.

 

Loose enough to rattle. My neighbor told me it could be that I forgot to put some antirattle springs back on the inside shoe so we are going to check that out today.

Thanks.

Jack

 

oh you mean the pads are rattling. Yes, there are these metal tabs you place betweend the pad and the caliper piston to keep constant pressure on the rotors. That could be making noise too. Sorry, I always assume worst case senario.

 

did you replace the bolt, locking key AND the locking key spring (looks like a small single leaf leafspring) with new ones when you replaced the caliper and put some high temp brake grease on the caliper sliding surfaces?

the calipers should be tight in the bracket, so tight that you have wonder how they can move at all.

 

I did not replace the spring and key. Can you buy those at the parts store?

Thanks.

Jack

 

Are there two pin type deals for each caliper that hold them in place. On my 89 F350 the pins are to pieces of metal with rubber in between, about 3 or so inches long. The rubber was old and compressed which is what was causing them to rattle. I got new/er ones from a junk yard donor.

 

there are no rubber parts in the 77.

yes you can buy the locking key