GSpeed

For years, there has been a need for a real race car master cylinder setup. In the past, we have retrofitted floor mount pedals ( lots of fab, and driver position must change) or hanging pedals ( again, lots of fab, and need for dash bracing that not all have)

We recently were approached to build another floor mount pedal assembly, and while the customer was perfectly happy paying the 6500$+ price tag, it didnt make business sense to us.

Enter our OEM replacement master cylinder setup. Using the stock brake pedal assembly, and stock mounting points, this system is literally bolt up, build lines, attach bias ****, and go racing.

Its designed to work with racecars and high performance street and track cars.

• Saves 2lbs over stock
• Nearly unlimited master cylinder sizes
• Uses Tilton Pivot master cylinder with factory adjusted bleed port
• OEM bolt in, no modifications necessary
• pedal rod adjustable to change pedal height
• booster assembly no longer needed
• fully bias adjustable from inside cockpit (location and brand up to end user. Note: Bias adjustment not possible with OEM ABS system due to factory plumbing layout)
• Integrated reservoir assembly, includes clutch reservoir as well
• Adjustable pedal ratios (4.7:1, 5.5:1, 6.2:1) enable the brake pedal to be tuned to driver preference without having to change master cylinder bore size.
• Sealed bearings used throughout.

Currently in production. Price TBD, but expected 3k$ +/- fully loaded with masters, reservoir, mounts and balance bar assembly.


Please call or email to place an order.

trackboss

I've had a similar idea for years, but to use the factory booster. Too many projects and just never took off with it. Anyway, it takes a lot to impress me and this is impressive. Well done!

93ASP

Interesting design - definitely would be much easier to update to dual master cylinders this way than fabricating a pedal box. I wasn't aware that Tilton master cylinders were compatible with abs...

GSpeed

They can be compatible, if used appropriately. When used with an OEM ABS system, you'll have to use two identical master cylinders, and set the bias bar permanently at 50%. The OEM master cylinder is diagonally paired (LF & RR on one circuit, RF & LR on the other), and you'd be emulating that same plumbing circuit with these manual cylinders.

You would still get the benefits of removing the vacuum booster and ability to change pedal & hydraulic ratios, though. Once you move to an aftermarket ABS system (Bosch M4, etc) you'd be able to change master diameters to match caliper & rotor upgrades, adjust bias from the cockpit, etc.

Jake

c5racr1

Do you have a installed picture?

GSpeed

Not yet, the first few are in production still. We'll update this thread once we have installed pictures of the finished product.

This was one of those fun projects where the customer says, "Hey, I want to run dual master cylinders, but I don't want to do overhung pedals or floor-mounted pedals since I'm tall. Figure it out."

First couple of kits are already spoken for, but there's more in the pipeline.

Jake

c5racr1

I feel his pain. 6'4" in a vette. I'm interested

ScaryFast

Hi Jake,

This is not correct on a C5, I am not sure about C6 but i assume the same. The C5 OEM master is front and rear circuits, not cross car like most.

I found this thread because my rear circuit failed last weekend in qualifying and i am wanting an improved replacement...please get these on the shelf and you have a customer!

GSpeed

Oh hey, that's awesome! We should have parts in hand by the middle of the month. We'll keep this thread updated as things progress.

GSpeed

That's good to know. We had not dissected a c5 yet, but the c6 doesn't split the circuits like one would think. It pairs a front with a rear. Not two rears or two fronts.

Louis

ScaryFast

I work in the OEM brake biz and most vehicles seem to do it diagonally as you mention. I didn't realize the C5 did it F/R until three days ago. I am happy to ship you a bad MC for analysis if it helps, assuming Raybestos is unwilling to replace it for me under warranty...

GSpeed

https://gspeed.com/product/corvette-...ke-conversion/

First article going to speed south, we have one left from the first batch. We can get the cost a little lower if we get some sold for batch 2.

Dubstep Shep

This is pretty badass...

So your suggestion would be to use this with an aftermarket ABS system? Any chance you guys have something done along those lines? I'm not a huge fan of the factory ABS and would love to see how much better this is with something like that.

GSpeed

That would be the highest performing option, yes. We've installed the Bosch M4 ABS system on several cars, and it's great. Install is fairly time consuming, since you're basically creating a new brake system, and you'd lose any traction control or active handling with the OEM system.

GSpeed

We installed the prototype today in a customer's car today. The factory ABS system is deleted, and lines are plumbed directly from the Tilton master cylinders to the OEM hardlines.





Of course, we tested it on track, and it works great. Pedal effort is higher, as you'd imagine, but very easy to modulate and control.



Pricing is currently set at $4200, but if we get enough interest we could do a Group Buy and lower the price.

C5 Hardtop

Nice looking piece.

I'm curious about the brake booster being removed. What is the intent with that and making the pedal harder to push?

GSpeed

The two main reasons are adjustable braking bias from the driver's seat, and ability to change master cylinder sizes to match calipers.

The pedal is more firm than a vacuum assisted system, sure, but at around 90lb/G, it's very manageable. Of course, that can all be adjusted to match driver preference.

Jake

GSpeed

Several kits out in service, with no issues to date. This is a wonderful upgrade if you really want to take control of the braking system and know the value in what this kit brings to the table.

romandian

what does the "bias ****" do? limit rear pressure or ist is really proportioning?

mattastick

You can see the bias bar in the pictures that G-Speed posted. A prop valve limits pressure. This is actually changing the pedal force distribution between the 2 MCs.