Congrats to our New President Anguss!!
Remember to like us on Facebook!! - https://www.facebook.com/skylinesdownunder

Author Topic: Removing Brake Booster R33 ABS  (Read 1257 times)

Littlehorn

  • RB25DET
  • ****
  • Posts: 350
    • View Profile
Removing Brake Booster R33 ABS
« on: June 07, 2012, 06:14:19 PM »
I am removing the ABS breaking system from my car and wondered if anyone has removed the brake booster? Is this a difficult Job and do i need to modify it much to make it work?

BADHAB|T

  • RB26DETT
  • *****
  • Posts: 4843
    • View Profile
Removing Brake Booster R33 ABS
« Reply #1 on: June 07, 2012, 06:21:21 PM »
Physically removing the booster isn't difficult. But the way I read your post, you make it sound like the booster is being binned and not used at all ...? :confused:
The booster has nothing to do with the ABS system

Littlehorn

  • RB25DET
  • ****
  • Posts: 350
    • View Profile
Removing Brake Booster R33 ABS
« Reply #2 on: June 07, 2012, 07:24:08 PM »
Correct it would be binned, I need to get an 8 point roll cage in and its either bin it or get a pedal box with master cylinders mounted inside the car.
Would prefer the second option but I have seen that people who do this in skylines have difficulty mounting the pedals around/beside the steering column without modifying the pedals.

westybob

  • RB26DETT
  • *****
  • Posts: 2990
    • View Profile
Removing Brake Booster R33 ABS
« Reply #3 on: June 08, 2012, 06:20:01 AM »
Removing the brake booster is easy but I don't think you're going to like the result. Have you tried braking with the engine off? The system is designed for power brakes - you will need to make some major changes to be able to stop the car without the power assistance. Would probably be easier to redesign the roll cage.

gtsr

  • RB26DETT
  • *****
  • Posts: 9390
    • View Profile
    • http://
Removing Brake Booster R33 ABS
« Reply #4 on: June 08, 2012, 07:11:59 AM »
The stock brake system is designed to use one master cylinder, reservoir with booster for front and rear.

From what I understand, can use a Wilwood or Tilton pedal box with 2x master cylinders on brake pedal and 2x firewall mounted reservoirs (one brake master cylinder, reservoir for front wheels and the other brake master cylinder, reservoir for the rear wheels) that replaces brake booster, single master cylinder setup.

Cardwell Racing Supplies sells them -

http://www.cardwells.co.nz/Our_Brands/Wilwood_Disc_Brakes/Pedal_Boxes/MenuId/16.aspx

You can run a single brake pedal with dual mastercylinders, single clutch pedal if pedal box itself won't fit around steering column.
« Last Edit: June 08, 2012, 07:14:04 AM by gtsr »

Littlehorn

  • RB25DET
  • ****
  • Posts: 350
    • View Profile
Removing Brake Booster R33 ABS
« Reply #5 on: June 08, 2012, 06:37:46 PM »
Yeah, I was concerned with the brake feel but I know some race cars have unassisted braking so figured that it cant be that bad once the pads get up to temperature.

I may have found a potential solution, going to check out the Race Brakes R33 GTR they have installed an 8 point cage around the existing braking system including leaving in the ABS unit. Im just not sure how close the 33 GTR engine bay is to my car.

westybob

  • RB26DETT
  • *****
  • Posts: 2990
    • View Profile
Removing Brake Booster R33 ABS
« Reply #6 on: June 09, 2012, 07:26:14 AM »
Quote from: Littlehorn;600473
Yeah, I was concerned with the brake feel but I know some race cars have unassisted braking so figured that it cant be that bad once the pads get up to temperature.

I am not talking about "feel" I am talking about not being able to pull the car up at all at the end of the straight and going straight ahead!

Its not about pad temperature its about the relative sizes of the pistons in the M/C and calipers etc. Brakes for use without power assistance are designed differently. Maybe wander in to Race Brakes and have a chat.

gtsr

  • RB26DETT
  • *****
  • Posts: 9390
    • View Profile
    • http://
Removing Brake Booster R33 ABS
« Reply #7 on: June 09, 2012, 08:19:48 AM »
I agree with talking to Race Brakes about size of brake master cylinder piston vs caliper, etc.

Below are some examples of different setups on R32's (don't think R33 would be any different).

Hoppy is running a floor mounted AP pedalbox (clutch pedal, brake pedal, accelerator pedal) in his R32GTR racecar with rollcage -

http://www.advan.co.nz/page14/page21/files/page21-1000-full.html

Can see how it fits around rollcage, steering column.

I think this is a customers R32 (without rollcage, full interior) that has a floor mounted Tilton pedal box for clutch, brakes, stock accelerator pedal and brake bias adjuster next to steering wheel -

http://www.advan.co.nz/page14/page17/files/page17-1005-full.html

Floor mounted pedalbox seems to be the way to go.

Manson R32GTR runs the master cylinders, reservoirs in engine bay -

http://3.bp.blogspot.com/_vhpEGyEVhes/Sr_S7kaTQDI/AAAAAAAAB-8/JLoplLmEgNU/s1600/IMG_2882.JPG

I think they are using firewall mounted pedals and same location for brake bias adjuster -

http://3.bp.blogspot.com/_vhpEGyEVhes/Sr_S8Ab94KI/AAAAAAAAB_E/Nu9ZPA9SE8Q/s1600/IMG_2883.JPG

sonoramicommando

  • RB26DETT
  • *****
  • Posts: 951
    • View Profile
Removing Brake Booster R33 ABS
« Reply #8 on: June 09, 2012, 10:04:30 AM »
the brake feel or effort of booster completely removed won't be the same as those of booster installed with engine off cos booster has a big spring in it.