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Ongoing soft brake pedal

Discussion in 'Suspension, Brakes, Wheels & Tyres section' started by Henry Simmons, Sep 7, 2022.

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  1. Sep 7, 2022 #1
    Henry Simmons

    Henry Simmons

    Hi all, I have an RS 250 track car, it’s a great car but I have had ongoing issues with a soft brake pedal. I have changed all calipers, master cylinder, stainless steel lines all round, Godspeed discs and RC5 pads. It has been bled, flushed, bled with abs running and it is still soft. I run motul 700. Interestingly when handbrake is pulled tight the pedal firms up. Also when pressed to about 30% fronts engage before the back. Does anyone have any thoughts on what I am dealing with here or missing? Thanks
     
  3. Sep 8, 2022 #2
    Yorkie

    Yorkie

    Can only really be air in the system somewhere or possibly one of the pistons sticking. From what your saying with the hand brake I’d start by making sure the rear caliper pistons aren’t sticking
     
  4. Sep 8, 2022 #3
    Danny Danger

    Danny Danger

    Have you pressured the system to make sure it isn’t leaking from somewhere.
     
  5. Sep 8, 2022 #4
    Henry Simmons

    Henry Simmons

    Thanks mate and yes have a good pressure kit, would you happen to know if there is anyway air in the clutch slave cylinder can impact brakes. This has not been bled and I know they use the same fluid etc.
     
  6. Sep 8, 2022 #5
    Henry Simmons

    Henry Simmons

    Thanks mate, I will recheck this.
     

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