turbogrill 441 Posted October 16 Report Share Posted October 16 Hi, I think something is wrong with the brake booster or brakes on my 1.6 Na Miata. With the car standing still, if I press the brakes and then blip the throttle the brake pedal pushes upwards. I also sometimes lockup the brakes, I think it's when I heel toe. When blipping the throttle it seems like it brakes harder. Should the amount of vacuum directly control the braking effort? That seems a bit strange, wouldn't it be somekind of regulator or something? Quote Link to post Share on other sites
wvumtnbkr 6,996 Posted October 16 Report Share Posted October 16 Do you have a check valve in the system? If not, add one. Also, there is a thing called a reaction disc that helps regulate the amount of brake boost by how hard you are pushing on the pedal. My guess is you don't have a check valve. The reaction disc is rarely an issue. 2 Quote Link to post Share on other sites
turbogrill 441 Posted October 17 Author Report Share Posted October 17 2 hours ago, wvumtnbkr said: Do you have a check valve in the system? If not, add one. Also, there is a thing called a reaction disc that helps regulate the amount of brake boost by how hard you are pushing on the pedal. My guess is you don't have a check valve. The reaction disc is rarely an issue. Thanks, will check next time. I think they are supposed to have one but my car has had a long life as a race car in many different series. I just got it. Quote Link to post Share on other sites
Slugworks Paul 1,742 Posted October 17 Report Share Posted October 17 yeah your check valve is bad or it doesn't have one. Imagine how it feels if your car operates on positive manifold pressure! (ask me how I know... that was scary!) Quote Link to post Share on other sites
turbogrill 441 Posted October 17 Author Report Share Posted October 17 3 hours ago, Slugworks Paul said: yeah your check valve is bad or it doesn't have one. Imagine how it feels if your car operates on positive manifold pressure! (ask me how I know... that was scary!) Hmm, positive manifold pressure? As in turbo? 1 Quote Link to post Share on other sites
wvumtnbkr 6,996 Posted October 17 Report Share Posted October 17 2 hours ago, turbogrill said: Hmm, positive manifold pressure? As in turbo? That's how I learned about check valves! A turbo swapped rx7 into turn 4 or 5 or whatever it is called at barber (the left hander). No brake boost. Sweet... Quote Link to post Share on other sites
turbogrill 441 Posted October 17 Author Report Share Posted October 17 41 minutes ago, wvumtnbkr said: That's how I learned about check valves! A turbo swapped rx7 into turn 4 or 5 or whatever it is called at barber (the left hander). No brake boost. Sweet... Trust your leg muscles? Quote Link to post Share on other sites
wvumtnbkr 6,996 Posted October 17 Report Share Posted October 17 27 minutes ago, turbogrill said: Trust your leg muscles? And my pre wash spray for the laundry... 1 1 Quote Link to post Share on other sites
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