crap brakes
Have an account? Register

Forgot your password?

Forgot your username?

 
Likes Likes:  0
+ Reply to Thread
Page 1 of 3 1 2 3 LastLast
Results 1 to 10 of 24

Thread: crap brakes

  1. #1
    Official RnS Addict stevie.t's Avatar
    Join Date
    Apr 2009
    Location
    west midlands
    Posts
    2,806
    Images
    259
    Post Thanks / Like
    stevie.t is offline

    crap brakes

    im still messing with my brakes and still have,nt got any were so iv bought a gauge to test the psi at each caliper, im going to connect it were the bleed nipple is, what psi do you think i need to see ie 1000 is good 50 is no good

  2. Remove Advertisements
    RodsnSods.co.uk
    Advertisements
     

  3. #2
    Off the Xmas card list kapri's Avatar
    Join Date
    Apr 2009
    Location
    Portsmouth
    Posts
    22,990
    Images
    12
    Post Thanks / Like
    kapri is offline
    3/4 m/c Disc drum, no servo, around 750 , stops but feels crap , 1000 psi works well but needs servo to get it there

    All disc system needs a minimum of 1000 psi to work 'ish' ,1500 should give very good stopping.

    I'd be interested in any figures you record, not just maxed out but step by step readings , say every 10mm of travel.

    Also readings with and without servo operating woudl be beneficial

    Once you've recorded tell me your servo size , m/c bore and pedal ratio and we can compare what it is supposed to be producing.

    Yours is REALLY bugging me !!

  4. #3
    Official Drag Addict.... BRIT DIGGER's Avatar
    Join Date
    Apr 2009
    Location
    manchester
    Posts
    7,446
    Images
    1673
    Post Thanks / Like
    BRIT DIGGER is offline
    Steve have you got fancy race pads in that work when hot?..








    no?..... well press harder ya faggot.......

    Sid.
    DRAG RACING IS A DISEASE FOR WHICH THERE IS NO KNOWN CURE.

    Oddlot Drag Racing Team....
    ............."havin fun is usual"

  5. Remove Advertisements
    RodsnSods.co.uk
    Advertisements
     

  6. #4
    Official RnS Addict stevie.t's Avatar
    Join Date
    Apr 2009
    Location
    west midlands
    Posts
    2,806
    Images
    259
    Post Thanks / Like
    stevie.t is offline
    Quote Originally Posted by kapri View Post
    3/4 m/c Disc drum, no servo, around 750 , stops but feels crap , 1000 psi works well but needs servo to get it there

    All disc system needs a minimum of 1000 psi to work 'ish' ,1500 should give very good stopping.

    I'd be interested in any figures you record, not just maxed out but step by step readings , say every 10mm of travel.

    Also readings with and without servo operating woudl be beneficial

    Once you've recorded tell me your servo size , m/c bore and pedal ratio and we can compare what it is supposed to be producing.

    Yours is REALLY bugging me !!
    hi kev, if your bugged think how i feel lol, iv bought a gauge of ebay and im going to get a flexy made so i can use difrrant fittings, the system iv got is as follows , escort mk1/2 servo, cosworth rear calipers, xj6 front, xj6 mc 15/16 bore, pedal is stock but iv made it so ican extend were the mc pushrod connects thefore the leverage, all the calipers return, dont leak and are not seized, the mc is new as are all the pipes, hopefully the gauge will give me some idea as to whats going on, you would think the system would be a least half right as the mc and front calipers are of the same car? i was going to convert the rear back to drums as this would then be the same as my truck and they work well but this should not be nessesery, are you going to the swop meet? if so ill see you there and ill say hello

  7. #5
    Official RnS Addict stevie.t's Avatar
    Join Date
    Apr 2009
    Location
    west midlands
    Posts
    2,806
    Images
    259
    Post Thanks / Like
    stevie.t is offline
    Quote Originally Posted by BRIT DIGGER View Post
    Steve have you got fancy race pads in that work when hot?..








    no?..... well press harder ya faggot.......

    Sid.
    sid i like faggots, best with pea's and potatos, and if i press any hareder the floor will bend

  8. #6
    Off the Xmas card list kapri's Avatar
    Join Date
    Apr 2009
    Location
    Portsmouth
    Posts
    22,990
    Images
    12
    Post Thanks / Like
    kapri is offline
    Yup, I'll be up there . We can exchange sketches possibly It SHOULD be working, m/c and caliper combos good . I want to see those figures !

  9. #7
    Official RnS Addict Pughy's Avatar
    Join Date
    Oct 2009
    Location
    West Midlands
    Posts
    633
    Images
    340
    Post Thanks / Like
    Pughy is offline
    Any news on the brakes yet steve?

  10. #8
    Official RnS Addict stevie.t's Avatar
    Join Date
    Apr 2009
    Location
    west midlands
    Posts
    2,806
    Images
    259
    Post Thanks / Like
    stevie.t is offline
    yes i think so, i bought a gauge and some fittings, then we went from caliper to caliper and took readings from each, then we did the same with the engine running to see if there was any diffrence, no there was,nt,we then altered the fulcron point which gave more travel but a higher reading, then we disconected the rear brakes, this made a big diffrence, iv now ordered a proportining valve as we think because the preasure is the same front and back this is not allowing enough presure to the front,hopefully i will no soon fingers crossed

  11. #9
    Off the Xmas card list kapri's Avatar
    Join Date
    Apr 2009
    Location
    Portsmouth
    Posts
    22,990
    Images
    12
    Post Thanks / Like
    kapri is offline
    Pressure will be the same throughout th system with out a prop valve ( Pascals law ) . The actual size of the caliper bore dictates the final clamping pressure ( with pad area as well) .What line pressure did you get before and after?

    When you change the fulcum point how do you do it ?

    EDIT Just reread , there should be an increase in line pressure with the engine running as with the servo working it adds the surface area of the diaphragm x atmospheric pressure to the input pressure into the master cylinder.

    After you've run the engine can you pull the one way valve from the servo body and hear air entering and does the pedal sink when you start the engine ?
    Last edited by kapri; 14-03-2011 at 23:01.

  12. #10
    Rods 'n' Sods Junkie
    Join Date
    Dec 2010
    Location
    Nuneaton
    Posts
    392
    Images
    21
    Post Thanks / Like
    Weslake-Monza is offline
    The servo doesn't make any difference to the line pressure at the slave end of the system it simply reduces the pedal effort required.

+ Reply to Thread
Page 1 of 3 1 2 3 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Where you live, Town\City\County etc.

Please enter your full name
This field cannot be edited once it has been completed other than via contacting the site admin. Please make sure the information is correct first time.

Log-in

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

    Similar Threads

    1. My brakes have become crap too !
      By Richd-X in forum Tech Discussion
      Replies: 5
      Last Post: 26-07-2010, 22:43
    2. my brakes are crap
      By stevie.t in forum Tech Discussion
      Replies: 39
      Last Post: 26-07-2010, 22:29
    3. wilson weld brakes buick drums
      By 4potter in forum Stuff - FOR SALE
      Replies: 4
      Last Post: 16-05-2009, 22:47
    4. crap accessories
      By 45bobber in forum On Topic
      Replies: 47
      Last Post: 14-05-2009, 13:29
    5. crap driving rods
      By 29pu in forum On Topic
      Replies: 1
      Last Post: 08-05-2009, 07:36

    Bookmarks

    Posting Permissions

    • You may post new threads
    • You may post replies
    • You may not post attachments
    • You may not edit your posts
    •