Hydraulic Brakes on Treg coupling jammed on!!

Submitted: Wednesday, Dec 09, 2015 at 20:21
ThreadID: 131088 Views:1686 Replies:5 FollowUps:2
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Hi has anybody had this issue?
Is there a quick remedy?
It appears that the piston in the master cylinder is jammed in!
Is it best to leave the hand brake on when in storage??
I left it off and normally I'd leave it on! Maybe this has caused a problem???

Cheers

Pete
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Reply By: Life Member - Fred B (ex-NT) - Wednesday, Dec 09, 2015 at 20:48

Wednesday, Dec 09, 2015 at 20:48
I found the cheapest and best way was to replace the master cylinder with a new one, flush the brake lines and put in new brake fluid; good to go. Doesn't take a lot of mechanical know how, a pretty easy job.
regards
Fred B
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Follow Up By: Life Member - Fred B (ex-NT) - Wednesday, Dec 09, 2015 at 20:49

Wednesday, Dec 09, 2015 at 20:49
Forgot to add.. I do not leave the brake on in storage... I chock everything safely.
Fred B
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Reply By: 508 - Wednesday, Dec 09, 2015 at 21:16

Wednesday, Dec 09, 2015 at 21:16
Are the brakes disc? Its possible the pistons in the calipers are stuck. Take the wheels of and try to free the pads thereby moving the pistons back a fraction. You might find it will be okay.
Good luck

Alpero
AnswerID: 593641

Reply By: gbc - Thursday, Dec 10, 2015 at 06:40

Thursday, Dec 10, 2015 at 06:40
As fredb said - dodgy return on the master cylinder. Easiest to dice it and get another one. Pretty common.
AnswerID: 593647

Follow Up By: Tim F3 - Thursday, Dec 10, 2015 at 07:57

Thursday, Dec 10, 2015 at 07:57
Replaced my master cylinder 2 weeks ago ,cost $ 27.00 for a new one.
Also found pistons sticking from lack of use ,easy to clean.
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Reply By: Athol W1 - Thursday, Dec 10, 2015 at 09:19

Thursday, Dec 10, 2015 at 09:19
Peter

As the master cylinder used is usually a Girling design and the seal on the pushrod is not designed to be in the weather you have a situation of an alloy cylinder and also an alloy piston, add a little moisture and you get electrolysis, the effect is that the two parts chemically weld together.

Best remedy is to get a reconditioned cylinder that has had a Stainless Steel Sleeve fitted, that then gets away from the similar metals welding themselves together by chemical reaction.

Also be sure to completely change the brake fluid at least every 2 years so as to avoid/limit the corrosion within the hydraulic system.

Hope this helps.
Regards
Athol (Retired Motor Mechanic)
AnswerID: 593651

Reply By: Lostkiwi - Thursday, Dec 10, 2015 at 09:48

Thursday, Dec 10, 2015 at 09:48
Pete,

Had this problem with camper. There was a rusty/dusty build-up on the outer edge of the piston so it couldn't return. Real fiddly to fix but once cleaned up (6 years ago) they're fine. Hardest part was getting the piston in far enough to remove caliper. Once off you can pump the piston out with the hand brake.

Changed the fluid again recently. Couldn't believe the amount of dust through the system.

Good luck with the fix,

Bruce
AnswerID: 593652

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