Jump to content


Photo

Brakes Soft At High Speed?

vx220 brakes soft

  • Please log in to reply
12 replies to this topic

#1 MattMacc123

MattMacc123

    Member

  • Pip
  • 119 posts
  • Gender:Male
  • Location:Scotland, Stirling
  • Interests:Cars, Music, Guitars, fitness, Mechatronics and Robotics

Posted 26 July 2018 - 10:23 AM

Hi Everyone,

 

Had a bit of a worrying moment this morning, Overtook it a small truck that was going quite slow, there was a car in the distance in front of the truck and when i had passed the truck and slowed for the car the brake pedal went soft?

 

the car is completely fine at lower speeds, 60 mph and brakes are great, but at higher speed it seems to go soft? Is this ABS related? or is there anything else that could cause this? 

 

I noticed that the pipe going into the brake servo is corroded slightly at the bottom but there is no leak and brakes still function.

 

Any help would be appreciated. 

 

Thanks, 



#2 james_ly

james_ly

    Need to get Out More

  • PipPipPipPip
  • 864 posts
  • Gender:Male
  • Location:Reading, Berks

Posted 26 July 2018 - 10:43 AM

ABS gives you a hard pedal (and NO brakes!). I'd hazard a guess at old fluid.



#3 Madmitch

Madmitch

    Super Duper Member

  • PipPipPip
  • 566 posts
  • Gender:Male
  • Location:South of France

Posted 26 July 2018 - 11:07 AM

What he said!  Old fluid that has absorbed some moisture that turns to compressible steam at the higher temps generated by higher speeds.  That would also account for the corrosion. 


Edited by Madmitch, 26 July 2018 - 11:08 AM.


#4 siztenboots

siztenboots

    B# 7222

  • 26,629 posts
  • Gender:Not Telling
  • Location:Surrey

Posted 26 July 2018 - 11:22 AM

lack of servo assist vacuum



#5 MattMacc123

MattMacc123

    Member

  • Pip
  • 119 posts
  • Gender:Male
  • Location:Scotland, Stirling
  • Interests:Cars, Music, Guitars, fitness, Mechatronics and Robotics

Posted 26 July 2018 - 11:25 AM

hmmm servo assist vacuum? ill have a look at changing out the break fluid first :) see if that works, thanks for the help! 



#6 siztenboots

siztenboots

    B# 7222

  • 26,629 posts
  • Gender:Not Telling
  • Location:Surrey

Posted 26 July 2018 - 11:38 AM

sorry mistake , hard pedal = servo

 

do the fluid change and also do the clutch at the same time all the same system



#7 MattMacc123

MattMacc123

    Member

  • Pip
  • 119 posts
  • Gender:Male
  • Location:Scotland, Stirling
  • Interests:Cars, Music, Guitars, fitness, Mechatronics and Robotics

Posted 26 July 2018 - 11:43 AM

ahh super thanks for that :) daft question but was is the best fluid to use? its a standard 2.2 na. 

 

Thanks again for all the help! 



#8 siztenboots

siztenboots

    B# 7222

  • 26,629 posts
  • Gender:Not Telling
  • Location:Surrey

Posted 26 July 2018 - 11:48 AM

pagid dot 4 from eurocarparts , stick a whole litre through



#9 MattMacc123

MattMacc123

    Member

  • Pip
  • 119 posts
  • Gender:Male
  • Location:Scotland, Stirling
  • Interests:Cars, Music, Guitars, fitness, Mechatronics and Robotics

Posted 26 July 2018 - 11:51 AM

fantastic :) thanks so much for that! 



#10 Ormes

Ormes

    Scary Internerd

  • PipPipPipPipPipPip
  • 4,612 posts
  • Gender:Male
  • Location:Corsham (nr. Chippenham)

Posted 26 July 2018 - 01:34 PM

I'd say as likely to be abs as fluid

#11 ChrisO_VX

ChrisO_VX

    Member

  • Pip
  • 67 posts
  • Location:North

Posted 13 August 2018 - 06:31 PM

How much of a job is it to replace the fluid?  I boiled mine a little while ago after a sticky caliper (since repaired) had one of them constantly dragging (lost all brakes out on a run!  Which isnt much fun at all... )



#12 Ormes

Ormes

    Scary Internerd

  • PipPipPipPipPipPip
  • 4,612 posts
  • Gender:Male
  • Location:Corsham (nr. Chippenham)

Posted 13 August 2018 - 06:47 PM

Some will tell you it's easy and it takes 3 minutes, but I find it a total ball ache.

 

I get all 4 off the ground, take all 4 wheels off (which is parly why it's a ball ache as trays off etc.), and using a pressure bleeder, bleed all 4 + the clutch around 3 times, inverting the front calipers each lap... should take you an afternoon when considering fag breaks etc. ;)

 

 



#13 chris_uk

chris_uk

    I Fancy Joe

  • PipPipPipPipPipPipPip
  • 10,114 posts
  • Gender:Male
  • Location:Leeds UK

Posted 17 August 2018 - 12:03 AM

Id stick 2 litres through if you want it properly flushed out..





Also tagged with one or more of these keywords: vx220, brakes, soft

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users