Changing brake pads the wrong way
Discussion
stewartcampbell said:
The problem is forcing fluid backwards through the master cylinder which can worst case scenario invert the seals and also forcing dirty fluid back through the abs hydraulic unit which can damage it.
Inverting the seals I've heard of but didn't realise that was the fix.And the problem is?
Having done a few brake pad changes the way the OP has seen on youtube I cannot see the problem, but as always, it's only as good as the person doing the work. At least this way, you don't have to top up the brake fluid, so it saves a bit of time and mess. If the fluid needs changing, then ok dump it out the bleed nipple, but then you risk getting air in the circuit.
To each their own.
Having done a few brake pad changes the way the OP has seen on youtube I cannot see the problem, but as always, it's only as good as the person doing the work. At least this way, you don't have to top up the brake fluid, so it saves a bit of time and mess. If the fluid needs changing, then ok dump it out the bleed nipple, but then you risk getting air in the circuit.
To each their own.
Ive been changing brake pads for well over 3 years that way and not once have i ever flipped the seals in the master cylinder ive hear'ed it can be done but ive not known anybody thats done it.
The only times that ive opened the bleed nipple is when the flexi brake pipes have collapsed inside and stopped the fluid from being pushed back.
The only times that ive opened the bleed nipple is when the flexi brake pipes have collapsed inside and stopped the fluid from being pushed back.
stewartcampbell said:
The problem is forcing fluid backwards through the master cylinder which can worst case scenario invert the seals and also forcing dirty fluid back through the abs hydraulic unit which can damage it.
I think that's a load of b
ks.If pushing a piston in to return fluid was enough to invert the seal they would never be able to withstand braking pressures.
How can fluid moving the wrong way do damage? When the ABs is cycling or the pads back off when you release the brakes there is fluid moving that way too.
Centurion07 said:
stewartcampbell said:
The problem is forcing fluid backwards through the master cylinder which can worst case scenario invert the seals and also forcing dirty fluid back through the abs hydraulic unit which can damage it.
Inverting the seals I've heard of but didn't realise that was the fix.
Egon Spengler: There's something very important I forgot to tell you.
Peter Venkman: What?
Egon Spengler: Don't reverse the seals.
Peter Venkman: Why?
Egon Spengler: It would be bad.
Peter Venkman: I'm fuzzy on the whole "good/bad" thing. What do you mean, "bad"?
Egon Spengler: Try to imagine all life as you know it stopping instantaneously, and every molecule in your body exploding at the speed of light.
Ray Stantz: Total protonic reversal!
Peter Venkman: Right, that's bad. Okay. All right, important safety tip. Thanks, Egon.
I've always just pressed the pistons back in, believe the haynes manuals even instruct this, I have never had a problem, sheered many a bleed nipple off tho trying to bleed brakes so wont be touching them unless i actually have to.
Pressing dirty fluid back into ABS unit isn't going to happen either, there's feet of pipe and its a sealed system!
Pressing dirty fluid back into ABS unit isn't going to happen either, there's feet of pipe and its a sealed system!
thinfourth2 said:
I want to know how a seal can flip when it is held in a metal cylinder
We test seals at work up to 16,500 psi and they have never flipped
because! thinfourth, because!We test seals at work up to 16,500 psi and they have never flipped
on another note I just did the lotto as its not happened to me in the last 7 years.
my top tip Is to us a syringe to take some fluid out of the resivour, as it may have been topped up while the pads are low.
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