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Hydraulic trailer brakes - stuck on? general Qs

Post Options Post Options   Likes (0) Likes(0)   Quote Ecko Quote  Post ReplyReply Direct Link To This Post Topic: Hydraulic trailer brakes - stuck on? general Qs
    Posted: 14 Feb 2020 at 3:09pm
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Hi all

New trailer has hydraulic brakes that appear to be stuck on but haven't had this issue before.

Drove the boat back from Wellington without issue.

It's since been stored on a slight gradient with bow up.



How large should the gap between the pad and the disc be? 

Should I be storing it with the brakes on or off? It is chocked in place so can't roll.

When I drove the boat to the ramp yesterday (1km) when I got there the brakes were very hot, with a bit of smoke coming off them. Not a great smell either, but not sure if that was from operation down the hill on the way or not.

Any advice or observations welcome!
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Post Options Post Options   Likes (0) Likes(0)   Quote CrayZfish Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2020 at 3:20pm
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Stupid question, but do you have a little handbrake at the drawbar, used for applying brakes when not on vehicle. If so is this off?
 
 
Why choose either diving or fishing when you can do both. Besides crayfish tail is very good bait!!
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Post Options Post Options   Likes (0) Likes(0)   Quote Redfinger Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2020 at 3:23pm
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store with brakes off if you can - wheels chocked of course to stop any movement.
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Post Options Post Options   Likes (0) Likes(0)   Quote Ecko Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2020 at 4:44pm
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Originally posted by CrayZfish CrayZfish wrote:

Stupid question, but do you have a little handbrake at the drawbar, used for applying brakes when not on vehicle. If so is this off?

Yes we do, and that is off (i.e. not pushed forward and locked down).


Originally posted by Redfinger Redfinger wrote:

store with brakes off if you can - wheels chocked of course to stop any movement.

OK great thanks, that is what we have been doing.






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Post Options Post Options   Likes (0) Likes(0)   Quote Big -Dave Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2020 at 6:04pm
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The gap between the pads and the discs, is negligible.
I would take the wheel off, and use a screwdriver, to pry the caliper forward, thus driving the piston in. It should move ok with a bit of pressure. The wheel should rotate freely with some noise from the pads rubbing gently.
If it won't move, any one of three issues.
The caliper piston is seized. This will show as one brake only being hot or stiff. Both pads wearing excessively. Remove the caliper, operate the manual brake lever and pump the piston out of the caliper, inspect the seal, clean the piston and cylinder, lubricate with castor or rubber gease and refit. Bleed.
Caliper pin/s are seized. This will show as one pad wearing more than the other. Strip, clean and lubricate.
Master cylinder piston seized. Both brakes will be stiff or hot. Strip and clean, although it's arguable that a new cylinder is so cheap, just replace it.

In any case, keep all mineral cleaners and greases away from brakes. Mineral products damage the seals and boots. ie kero, petrol and lithium greases
you can't fix an idiot with duct tape, but it does muffle them for a while...
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Post Options Post Options   Likes (0) Likes(0)   Quote letsgetem Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2020 at 7:20pm
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I don't know about trailer brakes, but the rear brakes on my ute seize up if they get any salt water on them. If I park with the handbrake on, sometimes cant move later.
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Post Options Post Options   Likes (0) Likes(0)   Quote Motorhead Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2020 at 10:38pm
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Every thing Big-Dave mentions are definitely possibilities and sound advice . There is also a chance the compensation port in the master cylinder is blocked either by seal swell or plunger adjustment. This will allow fluid passage to the brake callipers but not return. As above master cylinder is inexpensive so just replace it if proven to be at fault.
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Post Options Post Options   Likes (0) Likes(0)   Quote Ecko Quote  Post ReplyReply Direct Link To This Post Posted: 19 Feb 2020 at 8:53am
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Thanks for all of your responses.
Will have another good look at it this afternoon and see if I can't resolve.

Will update
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