Club Cobra - Brake Booster & Master Cylinder

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Brake Booster & Master Cylinder

Discussion Tools

04-11-2023 11:52 AM - permalink

cycleguy55

I'm looking to replace my brake booster, master cylinder and combination valve. The current booster is a 9" diameter unit that was wrapped to protect it from header heat. It's rusted and there are no discernible markings or numbers on it. The master cylinder has some numbers, but they're hard to read and don't look like Ford part numbers. The ports are on the passenger side and most of the MCs I've lookat at online seem to have the ports on the driver's side, though there are some that have ports on both sides. I can plumb whatever I'd get, but getting some with passenger-side ports would make it easier.

Does anyone know which booster and master cylinder was generally used by Vern and WCC circa 1990-91?

I'd like to go to to a smaller, dual diaphragm booster, probably a 7" to get it further from the headers. Has anyone done this and, if so, which did you use and how did it turn out?

04-27-2023 12:19 PM - permalink

cycleguy55

Never mind. I struck out on the booster, as mine has the Ford eyelet, but a completely different bolt pattern than '60s era Mustangs. I still don't know what it's from, but I'm going to re-use it, albeit with better insulation.

As to the master cylinder, I'm going with the Wilwood Remote Tandem Master Cylinder. While I'm at it I'm also replacing my clutch MC with a Wilwood remote reservoir unit, and adding a three cell fluid reservoir on the firewall, connected to the MCs with -3 AN stainless braided lines.

05-23-2023 08:45 AM - permalink

cycleguy55

Plans have changed, yet again. The Wilwood Remote Tandem Master Cylinder won't fit into the recess on the front of my old booster. I could make a spacer and adjust the push rod, but I'm not going to go there.

Further research has unearthed the 1993 Mustang Cobra R booster. It's an 8.9" dual diaphragm booster and built for the 4-wheel disc brake system used by the Cobra R only in 1993. Apparently it's quite popular among those going 4-wheel disc brakes on Mustangs, so widely available. The MC mounting surface doesn't have the recess my current booster has, so that problem goes away.

https://lmr.com/item/LRS-2005C/1993-...-Brake-Booster

07-18-2023 06:48 AM - permalink

Big un

Hey cycleguy, did your install go well? I have twin grilling mc's with twin pushrods and a balance bar on the pedal. I'd like to install a tandem mc with booster (like yours above) but I think I have to replace my pedal to a single pushrod design..

07-18-2023 06:12 PM - permalink

cycleguy55

Booster installation went okay. It's slightly larger in diameter than the old booster, so it was a tight fit against the upper chassis tube. It's all hooked up and ready to go as soon as I can get the brakes bled. That, in turn, is waiting on some other work I need to finish first.

I'll post an update once I get it sorted out.

07-20-2023 09:12 PM - permalink

kitcarbp

Sounds like both vintage WCC brake systems use different components based on whatever Vern and his brother found back in the day. My 2004 built chassis use a booster and master cylinder from a late 70’s Ford F150 with my 4 wheel disc system. It took me a while using NAPAs website to find the right parts, NaPa has great website with component detail. Ive already had to replace my m/c once because Vern installed the cheapest rebuilt junk back in the day.

08-26-2023 07:45 AM - permalink

cycleguy55

Final configuration:
1) Wilwood Remote Tandem Master Cylinder, 1" bore (15/16" previously).
2) 8.9" dual diaphragm booster built for the 4-wheel disc brake system used by the Cobra R only in 1993.
3) Triple aluminum fluid reservoir on the firewall, connected to the MCs with -3 AN stainless braided lines.
4) GM-type combination valve https://www.summitracing.com/parts/SUM-760185
5) Adjustable proportioning valve in line to rear brakes.

I finally have it sorted out, and can report way better stopping than before. Very little pedal travel and strong brake booster - but not overly sensitive. So far, so good - and much better than before the change.

Overall, I'm quite pleased with the outcome.

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