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Thread: Locked front calipers

  1. #1
    llbuono
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    Red face Locked front calipers

    When i was younger a dealer fitted new front brake pad's to my 1100r honda rode about a 2 kay and felt the bike slowing down pulled up and the front brakes locked solid they were red hot and i had to drag the bike off the road, the dealer's mechanic turned up and took the front brake lever off and filed it down a bit and it was ok after that.

    A couple of weeks ago a woman who broke down on a 250 cafe racer had new brake pads fitted had the same experience on stock rd near the lights where rockingham road joins it, i posted it on here, she got picked up by a rac tilt tray truck.

    Tonight on the way home on old mandurah road just south of the safety bay roundabout, i pulled up to help a guy on a harley out and his front brake was locked solid same thing again after having new front pads fitted i told him to maybe drop the fluid to release the pad's which he was already doing.

    The reason i am posting this is my bike needs new front brake pads, i bought a new set yesterday from a motorcycle shop in vic park, they are organic ebc pad's and not being oem could this happen and what has caused this problem if it has happened to you in the past.

  2. #2
    Member Loud's Avatar
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    Pads don't cause this issue.

    The issue will be with the master cylinder, or improper installation.
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    It happen d to me after I picked up a second hand 1993 BMW about two kilometers from pick it up the front wheel started binding and by the time that I stopped from 60 kph it had locked up.

    The fix was a new Master Cylinder.
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    Or maybe the bike has had enough of trying to tell you to have a fkn look at it....

    and had to get your attention somehow..

    FFS you don't even check tyre pressures..

    Hint.. Pushed back caliper pistons for new pad clearance..???? there's ya problem...
    " Imagination is the seed of life..."

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    Member Duffman's Avatar
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    Rather than installing EBC organic pads, grind them into a fine powder and apply directly to your rims.
    Same result but more efficient.
    Respect is earned, not enforced.
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    Quote Originally Posted by Loud View Post
    Pads don't cause this issue.

    The issue will be with the master cylinder, or improper installation.
    This ^^ It's possible they had topped up the MC with fluid and then squeezed the pistons back and inserted the pads which would mean they're under pressure from the start or maybe didn't clean the pistons before putting the pads in and the pistons have jammed out
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    Noted. We'll check back on that one in three years
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  7. #7
    llbuono
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    Quote Originally Posted by Para045 View Post
    This ^^ It's possible they had topped up the MC with fluid and then squeezed the pistons back and inserted the pads which would mean they're under pressure from the start or maybe didn't clean the pistons before putting the pads in and the pistons have jammed out
    Son a mechanic fitted my pads today they work fine, they are sintered metal organics by EBC they are pretty progressive i like the feel of them.

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    Member agrid's Avatar
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    Take off cap, push pistons back, clean up mess (or use a syringe).
    -

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    Quote Originally Posted by agrid View Post
    Take off cap, push pistons back, clean up mess (or use a syringe).
    Pretty simple really but I do remember many years ago when I did the brakes on my old F100 wondering why the pistons were so damned hard to get back even using a G cramp, I'd forgotten that I'd topped up the reservoir over time as the pads wore
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    Quote Originally Posted by Phildo View Post
    Noted. We'll check back on that one in three years
    Quote Originally Posted by filbert View Post
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    fluid can be a cause also, IE if you top it up when the pads are worn when the new ones get fitted pistons push more fluid into the system & when they get hot bam! brakes locked up

    can be easy fixed with a few cracks of the nipple
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    depends on the spud installing them i suppose.

    all the pads ive installed never had a problem. i pull old pads out and undo bleed nipple to push pistons back then new pads in and do a bleed cycle or two.
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    Clean the pistons before you push them back. Always crack the bleed nipple on the caliper and push the fluid out never back through the master cylinder. Pretty simple stuff really..
    MM

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  13. #13
    llbuono
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    Quote Originally Posted by Marty MOOSE View Post
    Clean the pistons before you push them back. Always crack the bleed nipple on the caliper and push the fluid out never back through the master cylinder. Pretty simple stuff really..
    MM

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    That's what I usually do when the kay's get up, i wanted to get a variety if opinions on this subject as it seems to happen regularly, for example graelins brakes were fitted by a dealer's mechanic as was the womans 250 cc kawasaki i stopped to help on stock rd, the harley recently had just had the pads replaced by his harley dealership and my pad's had been fitted to my 1100 by a dealership, so all four examples here had been fitted by qualified motorcycle mechanic's.

    My son a Volkswagen master tech mechanic at 25, fitted mine he clened the slides and serviced the caliper's and my brakes are superb now as far as i am concerned, so are these case's just isolated incident's.

  14. #14
    Member BusaSteve's Avatar
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    As above... never had any problems...although I usually do not top up the MC as they wear in unless it gets too low.
    Smoke me a kipper...I'll be home in time for breakfast

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    I always top it up. I didn't add I also gravity bleed the brakes after every of change and sometimes between changes depending on what's going on. Change the fluid on my dirt bike once a month or so.

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    Quote Originally Posted by llbuono View Post
    That's what I usually do when the kay's get up, i wanted to get a variety if opinions on this subject as it seems to happen regularly, for example graelins brakes were fitted by a dealer's mechanic as was the womans 250 cc kawasaki i stopped to help on stock rd, the harley recently had just had the pads replaced by his harley dealership and my pad's had been fitted to my 1100 by a dealership, so all four examples here had been fitted by qualified motorcycle mechanic's.

    My son a Volkswagen master tech mechanic at 25, fitted mine he clened the slides and serviced the caliper's and my brakes are superb now as far as i am concerned, so are these case's just isolated incident's.
    Just a correction. The bike of mine that had this issue was a private purchase and the cause was not regularly changing brake fluid.

  17. #17
    llbuono
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    Quote Originally Posted by Graelin View Post
    Just a correction. The bike of mine that had this issue was a private purchase and the cause was not regularly changing brake fluid.
    Sorry graelin i thought you said they were new when we talking about it, but the other two were definately new brakes fitted by dealer's as were mine, the one thing two cases had in common is around two kay's from the dealership/where you picked it from in your case they stopped the bike, the woman's bike travelled around ten kays from fremantle and the harley the same.

  18. #18
    Member Duffman's Avatar
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    Quote Originally Posted by Marty MOOSE View Post
    Always crack the bleed nipple on the caliper and push the fluid out never back through the master cylinder.
    Is that because you top the reservoir up, or concern for contaminants, or another reason?
    Respect is earned, not enforced.

  19. #19
    Member GsxInShed's Avatar
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    Quote Originally Posted by Duffman View Post
    Is that because you top the reservoir up, or concern for contaminants, or another reason?
    Just so you never ever push fluid backwards through the master cylinder seals.....dude..
    " Imagination is the seed of life..."
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    Member Duffman's Avatar
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    Quote Originally Posted by GsxInShed View Post
    Just so you never ever push fluid backwards through the master cylinder seals.....dude..
    Why would it go through the seals?
    Fluids got a clear path straight to the reservoir, and would have no pressure behind it. (or at least heaps less than when you pull the lever)

    I've always gone back to the reservoir. Never considered there were other options.
    Respect is earned, not enforced.

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