P38A Brake pad change

tarphenry · Mar 8, 2016

Hi all, just read RAVE regarding pad change. mentions pushing cylinders back, but no mention of letting fluid out by loosening bleed nipple. I have always done this , is it not acceptable on a P38. Any advice gratefully received thanks

tomcat59alan · Mar 8, 2016

Check your level in the master cylinder, if it's not too full then there won't be a problem just pushing the pistons back.

tarphenry · Mar 8, 2016

HiI am changing the discs and all the pads so it will definetely overflow

tomcat59alan · Mar 8, 2016

tarphenry said:
HiI am changing the discs and all the pads so it will definetely overflow

You can always suck some out with a clean bottle and pipe. How did you get on with the second remote?

tarphenry · Mar 8, 2016

I have tested it but not fitted it yet,weathers too cold for me .Hopefully next week or so Thanks

Grrrrrr · Mar 8, 2016

Needs 2 people to bleed the brakes and a full charge of the battery.

tarphenry · Mar 8, 2016

I wont be bleeding the brakes!

Falk · Mar 8, 2016

remove the lid of the reservoir and put rags down if there is an overspill - if you open the bleed screw with no 'held' pressure - i.e. the pedal been held down - air can enter the system. That is the same for any brake system

55FM58 · Mar 9, 2016

I usually use a clamp - C clamp for wood working with plastic jaws to put pressure on the pistons then crack the bleed nipple as I tighten the clamp - or some one tightens the clamp, closing up the bleed nipple as the piston is nearly in. The rest of the movement can go back up to the master cylinder without risk of overflow.

tomcat59alan · Mar 9, 2016

55FM58 said:
I usually use a clamp - C clamp for wood working with plastic jaws to put pressure on the pistons then crack the bleed nipple as I tighten the clamp - or some one tightens the clamp, closing up the bleed nipple as the piston is nearly in. The rest of the movement can go back up to the master cylinder without risk of overflow.

You can buy the proper kit on the Bay for less than £15, item number available if necessary.

Saint.V8 · Mar 9, 2016

I do similar, compress the pistons and let it out the bleed nipple...just as the pistons are getting close to full retraction, I do up the nipple to prevent air getting in...never had an issue on any of the P38's (or other cars) I have done this with!

55FM58 · Mar 9, 2016

tomcat59alan said:
You can buy the proper kit on the Bay for less than £15, item number available if necessary.

Always interested if there is a proper tool available at a reasonable price.

What is the item number please?

tomcat59alan · Mar 9, 2016

55FM58 said:
Always interested if there is a proper tool available at a reasonable price. What is the item number please?

141707534660 Bugger, it's now a pound cheaper than when I bought mine

55FM58 · Mar 9, 2016

tomcat59alan said:
141707534660 Bugger, it's now a pound cheaper than when I bought mine

Many thanks - will go take a look. Murphys law always applies in such circumstances

Martian · Mar 9, 2016

That's a pretty comprehensive kit and very reasonably priced.

Mine is just a basic retractor and it probably cost twice as much!

tomcat59alan · Mar 9, 2016

Martian said:
That's a pretty comprehensive kit and very reasonably priced.

Mine is just a basic retractor and it probably cost twice as much!

Used it on a Transit rear calipers, they have to be screwed in as well as pushed back, worked a treat.

wammers · Mar 9, 2016

55FM58 said:
Always interested if there is a proper tool available at a reasonable price. What is the item number please?

A proper tool for this job on a P38 consists of an old pad and a G clamp.

55FM58 · Mar 9, 2016

Found this on youtube - looks like an interesting break- down on how to do it - although no mention of the pad wear sensors/

tomcat59alan · Mar 10, 2016

55FM58 said:
Found this on youtube - looks like an interesting break- down on how to do it - although no mention of the pad wear sensors/

Sorry, but anyone who needs a guide to change brake pads should not be doing the job IMHO.

wammers · Mar 10, 2016

55FM58 said:
Found this on youtube - looks like an interesting break- down on how to do it - although no mention of the pad wear sensors/

That's maybe because there aren't any.

P38A Brake pad change

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