QuestionQUESTION: Hello. i got an older Chrysler grand voyager. i now have changed all the braking pipes, the head cylinder, the problem is that when the brakes are cold the wheels runs fine, but then i go for a ride they gets hot, and after a little drive the wheels are stocked... we have tried all, and we can't see where and what the problem should be.. can you please help me..
Regards Kenneth Nielsen.
ANSWER: Hi Kenneth,
I am not sure what you mean by braking 'pipes' or the 'wheels are stocked'. Please rephrase or explain, and give me details about the history of the problem and which parts you have replaced. It sounds like the brake pads are dragging on the rotors. Is it the same at all 4 wheels or just 2 or 3? Please tell me the year of the vehicle and whether you have anti-lock or conventional brake system.
Roland
---------- FOLLOW-UP ----------
QUESTION: Hi again.
by the braking pipes/tubes i mean the thing where the brake fluid runs through. and the brakes gets so got that they are getting blocked.. the problem came after i changed all the braking tubes, because of rust problems, but after i got this problem. and yes, its all the wheels that is blocked. I have replaced the braking tubes, the head-cylinder. and yes, there is ABS system on the car, and we have also tried to disconnect the power to the ABS system to see if its the pump thats the problem and makes pressure the all the brakes. but no, it didnt make any changes. we also tried to disconnect the brake amplifier. the one that makes it easier to brake. we have also tried to change the level of the brake pedal, i mean we have tried to adjust when the pedal should activate the brakes, but this did not work either..
and im sorry, but i dont know the year of the car.
I hope the information was better this time.
Regards Kenneth Nielsen.
AnswerHi Kenneth,
Did you replace each of the flexible rubber brake hoses that connect the wheels' brake cylinders/caliper units to the solid brake lines mounted on the chassis which you changed out? Those rubber hoses, as they age, are subject to degradation (flaking) of the internal lumen through which the brake fluid passes and when they do so the common effect is that the fluid will successfully flow through them when under pressure such as when applying the brakes, but the fluid is impeded from spontaneously flowing in the reverse direction when you release the brakes due to the flakes. The result is the the individual brake pistons remain extended even though you took your foot of the brake pedal and that results in brake drag and consequent overheating. So that is the last step of the process you have undertaken to replace rusty brake lines: replace all four brake hoses.
The only other possibility is that the piston/cylinder interfaces are corroded but that would require replacing the brake cylinder/caliper at each wheel. That is less likely to be the cause compared to the hoses unless the vehicle was unused for a long period of time in humid conditions.
Good luck on this project!
Roland
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