hiya my dad has a (2002) 206 1.4 the front brakes keep sticking but not all the time! he can drive between 5-10 miles then the brakes stick on and the piston wont release without manually removing the nipple to release the pressure he has already changed the master cylinder trying to fix this issue but to no prevail! we then thought it might be the calipers not releasing so we removed and checked this manually nd found that pressing the piston and it retracted without an sticking, we are starting to run out of ideas and need some help now our final thought is that it could possible be the servo but there is no noises coming from the servo so were unsure what to do please please please help x
(Edited - Brakes - not breaks)
Brakes!
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Capncol
- Posts: 3761
- Joined: Fri Nov 11, 2011 12:40 pm
- Location: Reading & Southampton
Re: breaks!
It sounds as if the master cylinder is not returning fully, which means the ports in the cylinder aren't being opened to the reservoir. They are only open with the piston in the master cylinder fully returned.
If it isn't. then this will trap brake fluid in the line. When this happens and you use the brakes, the heat generated causes things to expand and if the fluid can't get back to the reservoir, it will cause the brakes to bind up. This is why it frees off when you release the bleed nipples. (I expect the pedal feels rock hard too)
When you fitted the cylinder, it should push home onto the servo with no resistance. I suspect you felt like you were compressing a spring in the last few MM's of pushing it home into the servo.
You need to find the cause of this. Start with the pedal. Is it free to fully return? Is it bent or damaged?
Is it the correct master cylinder for the car? Is the pushrod too long?
Basically you are looking for the reason why the cylinder won't fully return
If it isn't. then this will trap brake fluid in the line. When this happens and you use the brakes, the heat generated causes things to expand and if the fluid can't get back to the reservoir, it will cause the brakes to bind up. This is why it frees off when you release the bleed nipples. (I expect the pedal feels rock hard too)
When you fitted the cylinder, it should push home onto the servo with no resistance. I suspect you felt like you were compressing a spring in the last few MM's of pushing it home into the servo.
You need to find the cause of this. Start with the pedal. Is it free to fully return? Is it bent or damaged?
Is it the correct master cylinder for the car? Is the pushrod too long?
Basically you are looking for the reason why the cylinder won't fully return
Cheers Col.
206cc 1.6ltr (Wifes toy)
Mercedes ML (workhorse)
Corvette C3 (my toy)
When requesting help of a technical nature, please give as much detail of the fault as possible along with details of exact model, engine size & type, gearbox, year, mileage, and any relevant work carried out to try to solve the problem to help us help you.
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206cc 1.6ltr (Wifes toy)
Mercedes ML (workhorse)
Corvette C3 (my toy)
When requesting help of a technical nature, please give as much detail of the fault as possible along with details of exact model, engine size & type, gearbox, year, mileage, and any relevant work carried out to try to solve the problem to help us help you.
Better still, put the details in your signature.
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Capncol
- Posts: 3761
- Joined: Fri Nov 11, 2011 12:40 pm
- Location: Reading & Southampton
Re: Brakes!
Found this which may help you see what I'm on about
This pic shows the piston in the fully returned position. Notice the fluid intake and return ports are uncovered by the seals (open) and fluid is free to return up the brake pipes into the reservoir. Now if you forced the piston forward slightly (to the right) the ports would be covered by the seals and the fluid would be trapped in the cylinder, brake lines and calipers (the two brake pipes shown coming out of the bottom are always open to the cylinder)
Hope this illustrates it better.
This pic shows the piston in the fully returned position. Notice the fluid intake and return ports are uncovered by the seals (open) and fluid is free to return up the brake pipes into the reservoir. Now if you forced the piston forward slightly (to the right) the ports would be covered by the seals and the fluid would be trapped in the cylinder, brake lines and calipers (the two brake pipes shown coming out of the bottom are always open to the cylinder)
Hope this illustrates it better.
Cheers Col.
206cc 1.6ltr (Wifes toy)
Mercedes ML (workhorse)
Corvette C3 (my toy)
When requesting help of a technical nature, please give as much detail of the fault as possible along with details of exact model, engine size & type, gearbox, year, mileage, and any relevant work carried out to try to solve the problem to help us help you.
Better still, put the details in your signature.
206cc 1.6ltr (Wifes toy)
Mercedes ML (workhorse)
Corvette C3 (my toy)
When requesting help of a technical nature, please give as much detail of the fault as possible along with details of exact model, engine size & type, gearbox, year, mileage, and any relevant work carried out to try to solve the problem to help us help you.
Better still, put the details in your signature.
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Capncol
- Posts: 3761
- Joined: Fri Nov 11, 2011 12:40 pm
- Location: Reading & Southampton
Re: Brakes!
Looks like they didn't need help after all as not logged back in since 
Cheers Col.
206cc 1.6ltr (Wifes toy)
Mercedes ML (workhorse)
Corvette C3 (my toy)
When requesting help of a technical nature, please give as much detail of the fault as possible along with details of exact model, engine size & type, gearbox, year, mileage, and any relevant work carried out to try to solve the problem to help us help you.
Better still, put the details in your signature.
206cc 1.6ltr (Wifes toy)
Mercedes ML (workhorse)
Corvette C3 (my toy)
When requesting help of a technical nature, please give as much detail of the fault as possible along with details of exact model, engine size & type, gearbox, year, mileage, and any relevant work carried out to try to solve the problem to help us help you.
Better still, put the details in your signature.
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alexbillbridgnorth
- Posts: 45
- Joined: Thu Apr 18, 2013 10:11 am
- Location: Bridgnorth
Re: Brakes!
Haha! Ah well some other person maybe having this problem and stumble across the forum. Don't think of them think of the others you have helped 
You can make something idiot proof, but someone will just make a better idiot.