A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
MysticRich wrote: Hi tony
You haven't changed any of your brake lines have you ?
I recently fitted braided hoses all way along rear axle and removed all copper pipe and the brass T connection wasn't fully drilled so I couldn't bleed the brakes up proper.
Took 2hr scratching my head and stripping things and refitting to find the problem and a min to drill it out.
No Rich
Not changed anything other than one rear caliper. I changed to braided hoses when I did the conversion about 3 years ago.
This has got me totally stumped as the brake pedal feels fine without the engine running, its only when the engine is running that the pedal goes soft. I have bled loads of brakes and never come across this, it feels like there is air in there somewhere, but as to where I'm at a loss. I've bled the system 5 times now and used 4 bottles of DOT 4 fluid. It normally takes half a bottle and about 10 mins to do it.
Last edit: 11 Jul 2014 13:39 by bigoffroader. Reason: Spelling
Hi daft question but have you been on a test drive with it ?vw transporters are the same .pedal rocksolid with motor off . But start it up and if you press hard on the pedal it will go all the way to the floor . 2 min drive and they sort them selfs out . But this is my gess and i dont know how soft the pedal is on your jimny . Only you can make the choice if its safe to drive or not
Flameboi201 wrote: Hi daft question but have you been on a test drive with it ?vw transporters are the same .pedal rocksolid with motor off . But start it up and if you press hard on the pedal it will go all the way to the floor . 2 min drive and they sort them selfs out . But this is my gess and i dont know how soft the pedal is on your jimny . Only you can make the choice if its safe to drive or not
Yes been for a drive in it and they stop the truck, but there not right, way too soft to use on a daily basis as I need to
Flameboi201 wrote: Ok was just a idea . Was they ok before new caliper ?maybe u have a dud . As youve been through all the basics
Yes everything worked as it should.
I changed the rear axle so had to disconnect the rear brakes, when I refitted them I noticed the passenger side caliper weeping from the handbrake seal so I replaced it with a new one.
Now no matter how much I bleed them they are still soft
See if you can get a pressure bleader you need the one that clamps round the master cylinder and sits over the filler or push back all your caliper pistons and use a block of wood in each caliper to hold the piston in and try bleading it or take it to an mot station and see what brake has less effort
