68 firebird build - Lateral-g Forums

**geberhard** · #1 10-17-2012, 02:53 PM

Rene,

Are you using a prop valve or anything? Did you do ls all arond? Also did you use any spacers on the front or just flat plates to mount the caliper? Any pictures? Are the rear brakes locking when tires are lifted and spun by hand and brakes pressed?

Gui

68firebird · #2 10-17-2012, 05:31 PM

Quote:

Originally Posted by geberhard

Rene,

Are you using a prop valve or anything? Did you do ls all arond? Also did you use any spacers on the front or just flat plates to mount the caliper? Any pictures? Are the rear brakes locking when tires are lifted and spun by hand and brakes pressed?

Gui

yes I'm using prop valve, both master and prop valve are made for disc/drum setup. rear has stock drums. no spacers on the front, just the flat plates. the rear brakes are not locking while the front are. as far as the rear spinning while the brakes are pressed, can't try the just yet, need a helper for that.

**geberhard** · #3 10-17-2012, 05:52 PM

rene, any way to lift the rear (safelly!!!) and drive then press brakes?

It could be residual or prop valve issue. I would gut or disconnect and see if that is the problem.

What MC are you using?

68firebird · #4 10-18-2012, 04:24 AM

This is what I'm using.

http://www.performanceonline.com/Dis...lve-Kit-18817/

**geberhard** · #5 10-18-2012, 08:59 AM

Rene, have you tried just unbolting slightly the two bolts holding the MCto the firewall to see if your push rod is making too much contact with the MC? May be a simple troubleshoot approach, but I know on a 67 vert I had, when swapped the MC (supposedly same part number), the MC piston surface was closer to the rod.

Was hard to tell but the push rod was engaging the MC enough. I removd, adjusted the pushrod length turning it, and problem resolved.

Gui

68firebird · #6 10-22-2012, 05:46 AM

I haven't worked on the brakes at all since my question Gui, but since I've received many responses stating that the pushrod length is too long, thats what I'll assume it is at the moment. The reason I haven't checked on it is she is most likely in the garage now for the winter and I'm now thinking about putting a booster in.

If I put a booster in what size, 9 inch, 11 inch, does it matter? anything that I need to do to change over to the power booster or simply hook the booster in between and hood a vacuum hose up? any info would be greatly appreciated, and if you have any links to a recommended booster please post. thank you.

**geberhard** · #7 10-22-2012, 09:59 AM

Rene, one more area to check;do you have pics of your caliper mounting bracket for the fornt? Please note a LOT of people (including myself) bought wrong brackets and that wa spart of the issue. Some adapter brackets sell as LS (Camaro\Firebird) swap brackets when they are Corvette (C5) brackets. The caliper swill work, however the rotor and contact patch will be off.

Gui