Sunday 5 June 2011

Changing brake pads turned into nightmare on my '92 MX6 2.5L Manual?

I replaced all brake pads and found my back left calliper seized so i took it to the shop and $400 later it was freed up. however only one brake bleeds properly the rest are somehow blocked. to top it off it no longer gos into gear. when its in gear the clutch works fine (its also new). getting it into gear is the hard bit like hitting a brick wall. its now parked up on a driveway in reverse because the handbrake wont hold it. the shop said it may be the master cylinder or the abs. any help would be great.|||Mazda Specialist here. There are a couple of things that need to be done. First off, The Brake Caliper Bleeder Screws need to come off and have the rust or mud or both scraped out of them and then blown through with the air compressor. Then of course put back in.


The master cylinder on those feeds hydrulic fluid to both the brakes and the clutch so you need to do a full system bleed. The 92 does not have the OBD2 uplink from the WDS scan tool to do an automated ABS Sytem Bleed so you have to do it like this.





EXACTLY like this to clear out the ABS dump solinoids





Two People, one in the car to push the brake pedal and one under the car to open the bleeder screws.


Pump the brake pedal 3 times and then open the bleeder screw on the Rear Brake CLOSEST to the Master Cylinder. close after the person in the car indicates that thje pedal is at the floor. Repeat until all the air is out and you get nothing but fresh clean fluid


Top up the fluid in the Master Cylinder and then bleed the REAR WHEEL FARTHEST FROM THE MASTER CYLINDER.





%26quot;I say this in Caps because this is the way designated by Mazda%26#039;s engineer%26#039;s to do it.%26quot;





Then bleed the Front Wheel CLOSEST to the Master Cylinder and then the Front wheel FARTHEST from the master cylinder.





ALL THE WHILE MAKING SURE THE MASTER CYLINDER NEVER RUNS OUT OF FLUID OR YOU DO IT ALL OVER AGAIN.





After that, then Bleed the Clutch Slave Cylinder.





Use DOT 4 Brake Fluid Only|||For $400, you could have replaced both rear calipers...


It%26#039;s actually the handbrake (e brake) linkage that seizes, and although it can be cleaned and lubed, a replacement is the only cure...


This is a common fault..





The clutch may be adjusted wrongly, or it could be a slave or master cylinder leaking internally.. maybe just needs bleeding correctly... it%26#039;s definitely nothing to do with the ABS...





For any more help with the car, checkout www.mx6.com





John|||Your mistake was taking it to the shop instead of turning the calipers in for rebuilt units.





Sounds like the shop are idiots. If you are in CA it%26#039;s time to talk to the Bureau of Automotive Repair.|||Hi Not sure what an MX6 is but maybe Mazda ,your caliper problem could well be linked to the clutch operation if the clutch fluid is supplied from the brake master cylinder ,it would appear that the fluid may have been run to low ..


Okay 1st isolate the problem


clamp all flexible brakes hoses at wheels . press brake pedal


if pedal is hard ,master cylinder is ok


then release each pipe in turn ,checking pedal for pressure if pressure drops in one wheel only theres the problem .


some systems need to be pressure bled as the fluid will not drop from reservoir into master cylinder without pressure .


as in previous post ABS will not be the problem ,.


finally do not let the same people touch this as they are obviously unqualified ,, hope this will be of some help to you


Paul Liverpool UK

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