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Brakes sticking
#1
Hello i'm currently having some issues concerning the front brakes sticking have replaced the calipers.it seems to build up pressure in the system as you drive making the brake pedal hard. But if you push the pedal down hard it seems to release the pressure. Any advice is very much appreciated
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#2
Hi - I've seen this when the flexible brake pipes were clamped with mole grips/whatever during a caliper swap. Result was like yours - the pipe was collapsed internally so would not let fluid back out of the caliper under normal braking but when you really pumped/stood on the pedal it would open up the crimped bit and let some of fluid back up into the system.
                                                                                                                                                     
Our cars - 2008 1.6 HDi 92 Berlingo (His)
             - 2008 1.6 HDi 110 Mini (Hers)
             - 2008 1.4 HDi 70 Pug 207 (Sprogs) RIP 04/19
[-] The following 1 user says Thank You to GraemeT for this post:
  • keith1969
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#3
Could be as above ^^ or master cylinder sticking.
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#4
(19-08-2018, 05:43 PM)GraemeT Wrote:  Hi - I've seen this when the flexible brake pipes were clamped with mole grips/whatever during a caliper swap. Result was like yours - the pipe was collapsed internally so would not let fluid back out of the caliper under normal braking but when you really pumped/stood on the pedal it would open up the crimped bit and let some of fluid back up into the system.

Thank you Graeme T mole grips were used on the flexi brake pipes when the calipers were changed will get them changed hopefully it will cure the problem
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#5
Why did you change the callipers - because the brakes were sticking?
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#6
(20-08-2018, 06:56 AM)polar Wrote:  Why did you change the callipers - because the brakes were sticking?

Yes that is the reason why they got changed
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#7
Well it may still be the flexi hoses but you were already having a problem when you clamped the hoses to change the callipers.

The fact that if you hit the brakes again, hard, and they free off suggests the master cylinder to me - if it were the hoses it would more than likely cause the brakes to stick constantly.
[-] The following 1 user says Thank You to polar for this post:
  • keith1969
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#8
(20-08-2018, 09:27 AM)polar Wrote:  Well it may still be the flexi hoses but you were already having a problem when you clamped the hoses to change the callipers.

The fact that if you hit the brakes again, hard, and they free off suggests the master cylinder to me - if it were the hoses it would more than likely cause the brakes to stick constantly.

The master cylinder was replaced have replaced the hoses today and new discs but it still does it
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#9
Test the operation of the Servo (Brake Booster) 

http://www.newtonnet.co.uk/coupe/service...p@id=12476


EDIT.

This gives more info...

https://www.ebay.co.uk/gds/How-to-Diagno...669/g.html


.
My vehicle .... 2006 (m59) Berlingo Multispace Desire - 1.6 HDI 92 
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#10
(20-08-2018, 06:25 PM)keith1969 Wrote:  
(20-08-2018, 09:27 AM)polar Wrote:  Well it may still be the flexi hoses but you were already having a problem when you clamped the hoses to change the callipers.

The fact that if you hit the brakes again, hard, and they free off suggests the master cylinder to me - if it were the hoses it would more than likely cause the brakes to stick constantly.

The master cylinder was replaced have replaced the hoses today and new discs but it still does it

Huh  i suspect suspect jj may be on to something or abs module may have sticking spools?
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