After the recent track work, I have realised that my brakes still need work, the actual stopping power is fine, although I do have my eyes on an AP racing upgrade 8) But I have seen just how much the master cylinder flexs when under hard braking, which a brake stopper would eliminate, I think you can get them for silly money from J speed or Cusco, but I am going to try and get my own design made up. I am going to mount it of the suspension turret using the bolt holes from the PAS mounting, and combine it with a strut coming from the engine mount. Has any one done this before or had similar ideas? just for info, under hard braking my master cylinder moves about 1.0-1.5cm :shock:
I'm picturing you driving with the hood off and leaning out the drivers window to look at your cylinder while screeching to a stop. How did you see this?
I am guessing he had someone press hard on the pedal while he watched. The car being stationary of course. Sorry to take the magic out of it schmooot.
That's what I thought. The master cylinder is only bolted to the sheet metal firewall, so it makes sense that there would be movement. Seems you could just stiffen the firewall in the area of the master cylinder. I can't believe the firewall is moving 1 to 1.5 cm though (that's 10 to 15 mm). That's a lot of flex.
the movement we measured with the car stationary, but it is quite a lot, at least 10mm, It really does move loads. Having been away for the WRC Ireland rally not dome anything yet, but going to make up a template this weekend and get a local company to weld and fabricate it, if enough interest will see how many I can get and what price. Brake stoppers are a popular mod in japan for a lot of cars, so it must do something. Will keep you posted.
So can you describe the movement? Is it "in and out", "side to side", "up and down", a little of all? I suppose I can do the same test that you did to find out.
Its forward and backwards in the engine bay, the entire brake master cylinder with servo, moves towards the front of the car under heavy pressure on the brake pedal, I did the test with the engine running. In my opinion this forward movement is negating some of my pedal pressure and thus taking away some of the braking performance. I may also re inforce the pedal box to ensure that the mountings are not twisting when heavy braking is applied. I must stress that I do not find my brakes to be poor, I have all new components, inc a pair of new front calipers, master cylinder, and new stainless hoses, but I do feel that they can be improved a little by restricting any movement of the servo and master cylinder. I am not sure with LHD of the arrangement for the brakes, if the cylinder is still on the right hand side of the bulkhead when sat in the car. ope this helps, may help you with your motorsport interests with the V6 baby.
So if the movement is just in and out as you press on the brakes, you should be able to just weld a piece of angle-iron running up and down to the firewall to add some support, along side the master cylinder. This would stiffen the firewall area around the master cylinder and possibly the clutch master cylinder.
