Yet another TC Rear end thread... May 20, 2005, 03:43:09 AM I finished installing a TC rear end in my 1988 Tbird Sport. The rear wasn't a problem, the e-brake stuff sucked, but I finally finished it. I bled the rear brakes and went to test them by placing the car on jack stands and putting in "D." But the wheels didn't stop when I hit the brakes. "Okay" so I thought..."I'll bleed the brakes again." Well I ended up bleeding them 3 times and the master cylinder had plenty of fluid (I added before bleeding 1st time). My question: I was under the impression that the '88 Sport master cylinder and proportioning valve could handle the rear discs. So am I missing something or do I need to go as far as gutting the stock prop. valve, add an adjustable prop. valve, and install a new master cylinder? If I HAVE TO go with the new master cylinder/prop. valve, what are my options on M/Cs (keep in mind I have the stock 10" discs up front)? And if I decided to get industrious and change the front discs to TC 11" discs, what M/C and prop. valve would I use then?MISC Questions: Do '93 Cobra master cylinders work? Are they the same as SVO master cylinders? Are they the same as SN95 master cylinders (non Cobra)?I searched but couldn't find this specific question. Thanks everyone. -Bryan Quote Selected
Re: Yet another TC Rear end thread... Reply #1 – May 20, 2005, 11:18:53 AM 93 cobra mc is probley the best bet. thats what im getting soon for my cobra brake conversion. alot of people need the adjustable proportioning valve to get enough fluid back to the rear disks to get it to work. i think thunder306 didnt need it, but i did. also, did you load the back brakes? if not their not going to work even with a proporting valve. and those valves are like 40-50 from summit. Quote Selected
Re: Yet another TC Rear end thread... Reply #2 – May 20, 2005, 11:25:40 AM Quote from: bdulyI was under the impression that the '88 Sport master cylinder and proportioning valve could handle the rear discs. So am I missing something or do I need to go as far as gutting the stock prop. valve, add an adjustable prop. valve, and install a new master cylinder?The stock Sport master cylinder *should* be enough for rear discs. I've heard very few negative complaints. The bore and volume is fine. The stock proportioning valve won't work very well. It's set up for drum brakes. You should see the problem resolved, or at least get better, with an inline adjustable prop valve. The Summit $40 prop valve is made by Wilwood and is a quality piece.Also, you need to consider that the rear caliper hoses may have collapsed from the inside. That's a very common problem with those. Collapsed hoses = no fluid flow. When you bled the rear brakes, did you observe the rate and volume of fluid coming out? What was it like? Quote Selected
Re: Yet another TC Rear end thread... Reply #3 – May 20, 2005, 12:25:36 PM I'm not sure what you mean by loading the rear brakes? Would I be able to see collapsed hoses? When I bled the brakes the fluid just dripped out. I never saw any air bubbles which I thought was a little strange. Any more ideas? So I "could" just put in an adjustable prop. valve inline and it would theoreticaly solve the problem without changing master cylinders? In any adjustable prop. valve situation, do I need that plug that is talked about on the CoolCats article? Thank you so much. Bryan Quote Selected
Re: Yet another TC Rear end thread... Reply #4 – May 20, 2005, 12:41:22 PM When bleeding the brakes in a properly set-up rear disc car, you should get pretty good fluid flow. Right now you're simply not getting enough fluid, either because of the prop valve, or the rear brake hoses, or maybe both. You will need the Motorsport plug (M-2450-A) when you gut your stock one. This is to make your stock prop valve a simple brake line junction. The actual metering of the fluid will then go to the new inline adjustable prop valve. Brake hoses deteriorate from the inside out...unless you have cracks on the outside, you will never see how bad the inside is, until you cut the hose in half.From what one person has suggested, instead of the inline adjustable valve, you could install a new stock-type prop valve from an older Lincoln Versailles (around 1980-ish vintage). This car also had stock rear discs and the metering is set up for such. The report was that it worked fine...I have no experience with it but in theory it's a good solution if you don't want an inline adjustable valve. It's nice having the ability to fine-tune the system via the adjustable prop valve though. Quote Selected
Re: Yet another TC Rear end thread... Reply #5 – May 20, 2005, 01:08:08 PM Alright. I'll try putting on a prop. valve and new rear hoses. If I decided to throw on a set of TC front brakes, what master cylinder is my best bet? Does the brake booster need to be changed or is it one of those things that "should" work? Thanks so much.Bryan Quote Selected
Re: Yet another TC Rear end thread... Reply #6 – May 20, 2005, 04:15:30 PM I'm on my 3rd tc rear now.. Went from 355's to 373's and now back to 355's... and on all of them I never used a prop valve always setup stock.. Plus It's been like that for the last 10 years.. Car stops great and front brakes last long. Maybe when I need a master cylinder one day (still have my 160k mile stocker) I'll put one on.. Quote Selected
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