Jump to content


Photo

ST170 brakes


  • Please log in to reply
11 replies to this topic

#1 Gwyn

Gwyn

    Member

  • New Member
  • PipPip
  • 10 posts
  • Ford Model: Focus ST170

Posted 07 September 2008 - 07:15 AM

Hi there, new to the forum but not to Fords :rolleyes: :rolleyes: :rolleyes:
Problem with the brakes, ford focus ST170, coming to a stop from around 20-15mph to 0, you can feel the brake pedal pumping (not fast, around once a second). Is this an abs sensor fault or warped front discs, the car has just covered 27,000.
Any suggestions or experiences with this type of problem
Gwyn :unsure: :unsure: :unsure:

Have something to contribute?

Sign in or register to start a topic...

Sign up to FOC Premium Membership To Remove These Ads

#2 mintalkin

mintalkin

    Ford Enthusiast

  • True Ford Enthusiast
  • PipPipPipPipPip
  • 3,466 posts
  • Name: mintalkin
  • Ford Model: mondeo tdci 130
  • Year: 2006
  • Location: Staffordshire

Posted 07 September 2008 - 01:58 PM

90% sure it will be a warped disc

#3 Gwyn

Gwyn

    Member

  • New Member
  • PipPip
  • 10 posts
  • Ford Model: Focus ST170

Posted 07 September 2008 - 07:16 PM

90% sure it will be a warped disc

thanks for that info mintaklin
I'll source some discs this week, my previous car did 127,000 (9" solid discs) miles with the same discs, so much for 300mm vented discs brakes :rolleyes: :rolleyes: :rolleyes:

#4 mintalkin

mintalkin

    Ford Enthusiast

  • True Ford Enthusiast
  • PipPipPipPipPip
  • 3,466 posts
  • Name: mintalkin
  • Ford Model: mondeo tdci 130
  • Year: 2006
  • Location: Staffordshire

Posted 08 September 2008 - 08:03 AM

see if you can get hold of a dial gauge to check the run out of the discs before buying new just in case its something else

#5 Gwyn

Gwyn

    Member

  • New Member
  • PipPip
  • 10 posts
  • Ford Model: Focus ST170

Posted 08 September 2008 - 11:29 AM

see if you can get hold of a dial gauge to check the run out of the discs before buying new just in case its something else

Hi mintalkin
What's the max +/- in mm/thou (run out) you would expect to get on a dial guage reading before rejecting the discs. :unsure: :unsure: :unsure:
kind regards
Gwyn

#6 mintalkin

mintalkin

    Ford Enthusiast

  • True Ford Enthusiast
  • PipPipPipPipPip
  • 3,466 posts
  • Name: mintalkin
  • Ford Model: mondeo tdci 130
  • Year: 2006
  • Location: Staffordshire

Posted 08 September 2008 - 12:24 PM

anything above 0.1mm (0.004).would most likely cause pulsating

#7 Gwyn

Gwyn

    Member

  • New Member
  • PipPip
  • 10 posts
  • Ford Model: Focus ST170

Posted 08 September 2008 - 02:13 PM

anything above 0.1mm (0.004).would most likely cause pulsating

Thanks again mintalkin.
Will borrow a DTI from work midweek, will post the result hopefully by the weekend.
regards
Gwyn :rolleyes: :rolleyes:

#8 Gwyn

Gwyn

    Member

  • New Member
  • PipPip
  • 10 posts
  • Ford Model: Focus ST170

Posted 13 September 2008 - 11:24 AM

Thanks again mintalkin.
Will borrow a DTI from work midweek, will post the result hopefully by the weekend.
regards
Gwyn :rolleyes: :rolleyes:

DTI checks on each corner

Front off-side 0.03mm
Front near-side 0.03mm
Rear off-side 0.02mm
Rear near side 0.45mm :angry: :angry: :angry:

It was obvious when I jacked up the car (Rear-near side), that this was the culprud, the wheel was binding when Hand turned at one particular point, Further investigation showed a deviation of .45mm at this point for approx 12cm. Have ordered some discs today and hopefully put them on Tuesday evening. The brakes on this corner must have been running hot, hence affecting the performance & MPG.
Thanks again
Mintalkin
regards
G Jones

#9 mintalkin

mintalkin

    Ford Enthusiast

  • True Ford Enthusiast
  • PipPipPipPipPip
  • 3,466 posts
  • Name: mintalkin
  • Ford Model: mondeo tdci 130
  • Year: 2006
  • Location: Staffordshire

Posted 13 September 2008 - 02:15 PM

no problem glad you found the culprit

#10 Gwyn

Gwyn

    Member

  • New Member
  • PipPip
  • 10 posts
  • Ford Model: Focus ST170

Posted 16 September 2008 - 06:10 PM

:rolleyes:

no problem glad you found the culprit

:rolleyes: :rolleyes: :rolleyes:
I fitted new rear discs and pads this afternoon, it solved the problem. Used Ford origional parts, worst job was to push back the piston in the caliper. Your suppose to use a special ford tool, I got away with a 4" G clamp, made for the job, allthough it required a lot of effort to push the piston back.
Happy motoring :rolleyes: :rolleyes:
ps Thank god for forum's, saves a fortune in the end and a real satisfaction of doing and solving the problem yourself.
Gwyn

#11 Rikos

Rikos

    Too much time on the boards

  • Budding Enthusiast
  • PipPipPipPip
  • 858 posts
  • Ford Model: Fiesta 1.4 LX

Posted 17 September 2008 - 08:52 AM

Really glad that you managed to get this sorted

And good to see the forum could help ... thats what we're here for!

#12 vinnyvangough

vinnyvangough

    Ford Enthusiast

  • Moderator
  • 2,325 posts
  • Name: Steve
  • Ford Model: 2003 Focus TDCi, Escort Mk6 RS2000, Mk2
  • Year: 2003
  • Location: Devon

Posted 17 September 2008 - 11:11 AM

Result for FOC

Have something to contribute?

Sign in or register to start a topic...


Not what you're looking for?

Register now, we have a huge community of enthusiasts to answer any questions you might have



0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users