Pedal Box Master Cylinders

Discussion in 'Chassis' started by theboysmiffy, Nov 27, 2019.

  1. theboysmiffy

    theboysmiffy Paid Member Paid Member

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    Hi all.

    Going to install HRP pedalbox/column in the Mk1 Rocco and will be running standard Gti brakes with DS2500 pads on the front.

    Can anyone tell me the correct master cylinder size for the front and rear and which brand does everyone use/recommend?

    Do people run remote reservoirs into the engine bay or is there enough room under the dash?

    Thanks for any help.

    Adam
     
  2. theboysmiffy

    theboysmiffy Paid Member Paid Member

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  3. vw_singh Events Team Paid Member

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    That should be about right although you'll need a bias valve for the rear. If the rear still locks up too easy then use a 0.7 rear.
     
  4. theboysmiffy

    theboysmiffy Paid Member Paid Member

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    Thanks. Does the balance bar not do the job of the bias valve?
     
  5. theboysmiffy

    theboysmiffy Paid Member Paid Member

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    Just an update on this. Got all the above fitted inc new lines and braided hose and have bedded in the new discs/pads.

    I now have a very firm/wooden pedal that requires a lot of effort to push, so much effort that I can’t heel and toe whilst maintaining the desired pedal pressure. I do have sparrows legs but I think the issue lies with the car not my pins! I am literally pushing it as hard as I can.

    I don’t mind the feel of the pedal but the effort required seems excessive. Also the bias bar is wound pretty much towards the rear as there wasn’t a lot of rear braking force on the brake rollers.

    Should I wind the bias forwards, will this help with the effort required or am I going to have to change the master cylinders? Might there be something else I am missing?

    Any help from wise heads greatly appreciated.

    Adam
     
  6. theboysmiffy

    theboysmiffy Paid Member Paid Member

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    On the run out today I was locking the rears under hard breaking so figured it must be too rear biased regardless of what the rollers say. So I have wound the bias bar more to the front not realising it was so easy to adjust. On the short trial after adjusting I know have a softer pedal with more feel and stopping power. I will take it out tomorrow for a proper run tomorrow and see if it needs further tweaking and has fixed the previous issues.
     

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