View Full Version : rear disc swap bugs

Fairmont Kevin
04-20-2005, 10:33 AM
So this is where y'all went....

Hey, I put an 88 TC K-code and 93 CV discs in my 89 GM. Problems are:

1) No place to bolt the caliper mount braces on the housing. May have to weld up existing holes and make new bolt holes in the right place.

2) E-brake hookup and routing. Can't remember how the pass side cable runs across the car. Haven't spent any effort on mating front and rear cables, except to know they don't.

3) Rear brake moan. Possibly related to #1 above and #4 below

4) Poor rear braking. A master cylinder designed for a 15/16" wheel cylinder will not properly operate a caliper of considerably larger size (Fuck, I didn't measure it and I don't know what the fuck size it is). Need to change to 98-02 master after I do the front brakes.

Anyway, I know what to do about #4. Can anyone help me with 1-3?



PS: My car ran 15.8 @ 87 with the 3.55s @ 4210 LB (with me in it)!

04-20-2005, 12:40 PM
Good to see ya over here. Sorry I don't know much about this swap as I have not attemted it yet. I was just going to find a 92 axle and swap it over. Georges 93vic did it to his, I think his only problem was configuring the parking brakes.

Grand Marquis GT
04-20-2005, 01:13 PM
Hey Kevin! glad to see youve made it...

Anyways, scott should pop on at any time here, him or eric has the answers to your rear brake stuff, lol...

15.8 makes u faster than justin :D

04-20-2005, 08:13 PM
about time you found us kevin!

the braces i didnt use, i have no problems..........have done 3 rear disc swaps so far

the parking brake cables go into a metal bracket........did you harvest used cables and hardware?..............i ordered aftermarket cables for my towncar, but the one (cant remember which one) cable wasnt even close to fitting........you have to get creative hooking up the rear cables to the front cables.......ask eric, he's got rear discs and a grand marquis (towncar longer)

as far as a moan, did you use used rotors? could be rust on the inside of the rotor and the parking brake shoes are making noise on the rust?

and no rear braking?? damm my car stops awesome, and i'm using a stock rebuilt master cyl..........the towncar that i'm currently building i used a stock reman also

hope you get your issues fixed up!


Fairmont Kevin
04-20-2005, 10:11 PM
The e-brake drum is clean. The rotors were used, but like new thickness. I got all the cables, hardware and brackets, but hell if I can find the brackets! My parts came off a Town Car, so the intermediate cable wouldn't have helped.

My noise is definitely the same one that Mustangs have "anti-moan brackets" to solve. Just a harmonic damping weight hung off the caliper somewhere. Maybe I need some of those.

I also wonder if my drum brake master cylinder is causing the problem. Don't they have residual pressure valves?

How do you run the passenger side cable? Attached to the car floor or frame crossmember, or attached to the rear end? If you attach to the rear, do you run it over or under?

04-20-2005, 10:22 PM
No noise from rear disc brakes either, but I used new rotors and reman (loaded) calipers. I never installed the caliper braces either, but still have them.
I bought new Ford E-brake cables for a '93 CV. the passenger side loops up from the wheel and goes into a bracket thats attached with a 10mm bolt on the subframe in front of the gas tank. I re-used the bracket that was on my stock E-brake cables.

As far as rear braking is concerned, I would have to say its much better than the stock drums. Make sure you didnt kink a line or something, causing a presure drop to the rear.
Also, did you read my post about the adjustment nut on the rod coming from the brake booster? try adjusting that a 1/4 or 1/2 a turn.

Pimp Hard Or Bust
04-21-2005, 03:00 AM
15.8? rear discs?

i need pics and a mod list :)

Fairmont Kevin
04-21-2005, 10:55 AM
15.8? rear discs?

i need pics and a mod list :)

edit: I put my list in my sig

Car weighs 3960 without me, 4210 with. Car has made exactly 2 dragstrip passes. Has had sparkplugs changed once in the 3 years/50k mi since I built it, oil changed occasionally, no other effort made. Runs on 89 octane gas.

Fairmont Kevin
04-21-2005, 11:02 AM

I did see your post. I'll try that, but I expect there are other issues as well.