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      09-04-2017, 06:11 AM   #12
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Drives: 2008 E92 335i 6MT
Join Date: Sep 2016
Location: Canberra Australia

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Quote:
Originally Posted by juld0zer
By pushing the brake pedal down and holding it down, you close the port in the master cylinder that allows fluid to leave/return to the reservoir. If you don't, then you'll get air in the ABS module if the Honda is ABS equipped. Either way, you'll be up for a full bleed if the reservoir empties. You will lose some fluid when you disconnect the caliper but it will be very marginal - just enough to relieve the pressure and whatever dribbles from the hose

You will need to strip back the piston boot to see what's going on. Part of rebuilding a caliper involves sliding the new boot onto the piston then refitting the piston - this allows you to see where you are going.

Usually brake designers stipulate a minimum pad thickness to account for the potential of the piston popping out if both pads on a caliper were to be worn to metal - which for some cars is a real possibility. BMW specifies 3mm as minimum pad thickness but IMO that is a bit generous.

So stepping on the brake pedal with no pads in place and popping out the piston, especially on the front is a real possibility. However it is usually accompanied by a loss of fluid. Try twisting the piston and pushing gently but squarely at the same time.
If you've broken the brake retractor tool its likely that the piston wasn't square, and if it's partly in it could be really jammed now depending on how much force the tool put on it

follow the advice you've been given, buy the rebuild kit, pull the caliper apart, you should be able to see what's happening, if you're lucky the piston won't be jammed in on an angle...good luck
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