77 brake questions

Reply Subscribe

Thread Tools

Search this Thread

Apr 6, 2013 | 01:14 AM

texastyler642

Thread Starter

Advanced

Joined: Sep 2009

Posts: 97

Likes: 0

From: iowa

77 brake questions

so im doing a few things to get my 77 back to being road worthy. i was messing with the brakes and i bled all of the bleeders and after a bit of braking, the pedal will get closer and closer to the floor. ill bleed them again and then the pedal is tight but will just start to get freeplay again. none of the bleeders are leaking, the calipers arent leaking, and i cant see anything coming from any of the brake lines. so im not sure if its the brake booster or the master cylinder or some other problem. anyone know what it could be or what to check for?

other question, the horn will just go off and random times. i have it unplugged because id go down the road and it would start honking. any ideas?

any help would be greatly appreciated, thanks!
-Hunter

Apr 6, 2013 | 01:24 AM

calwldlife

Team Owner

Joined: Jan 2007

Posts: 53,648

Likes: 878

From: Southern Cal Ca

St. Jude Donor '22

master cylinder will do that when bad

horn relay is being grounded by something or the relay is bad.

my relay, 81, is by the fuse box

Apr 6, 2013 | 01:35 AM

texastyler642

Thread Starter

Advanced

Joined: Sep 2009

Posts: 97

Likes: 0

From: iowa

is the only fuse block under the dash on the driver side? havent located another fuse box.

Apr 6, 2013 | 11:12 AM

Mike Ward

Race Director

Joined: Jul 2001

Posts: 15,892

Likes: 42

Did you change the rotors or have them turned?

Apr 6, 2013 | 11:20 AM

my 76 ray

Melting Slicks

Joined: Mar 2007

Posts: 2,520

Likes: 11

From: Hinckley OH

Are you getting air bubbles when you bleed the brakes? If so, the cause could be rotor runout. That is why Mike is asking if you changed or turned the rotors. Rotor runout causes the pistons in the calipers to be pushed in and out with every revolution of the tire. Lip seals on the pistons have a tendency to suck air into them when that happens.