Im wheely tired so i need a brake...

[Konakid]

how do you bleed a master?

[slide86]

yeah i was thinking bench bleeding it before fitting it to the car.

put the master in a vice, grip it where one of the bolts goes through

- fill the resivoir with fluid.
- grab a large philips head screw driver
- gently push the piston in all the way (watch out, fluid shoots out pretty quick)
- before allowing the piston to return, hold your fingers over the ports so that they are pretty much air tight.
- allow the piston to return, you will see the fluid go down and air bubble.
- repeat this several times

then fit the master back to the car and refit the lines.

complete another brake bleed, have some one sit in the car, open the bleed nipple, pump pedal 10 times, close nipple (ensure pedal is still pushed down when you close the nipple)
pump the pedal up hard, while the pedal is being pushed, open the bleed nipple once more, close nipple while pedal is pressed down

[driftke70]

couldnt have said it better

i like quick sharp pumps to get the initial pressure up, then long smooth ones towards the end.

[slide86]

are you talking bout bleeding this master cylinder or something else?

[driftke70]

the pedal when bleeding the brakes, basically quick sharp pumps then hold down and undo nipple, as soon as it touches the floor do nipple up, then quick sharp pumps again, once it has some meat behind it you slow the pumps down.

[slide86]

i was just being dirty, read it again! lol

[Konakid]

Lol!

Will bleed the master tomoro, cheers guys.

[driftke70]

hahah

[racsov]

if your lazy / if you havent tried it you can just bleed the master by cracking off the lines

so wait

when you bleed them you get good fluid flow, but shit pedal feel? sounds like internal valve/seal fault of the master, get a known ok condition one and put it in and see what happens

[Konakid]

So the saga continues (4 years later! since i bought it!) and after having my brakes bled properly at a brake joint which is well known they were slighlty out of adjustemnt at the rear drums and the hub freeplay. The pedal is still pretty shit.

F series Tarago Drum (25mm bigger than stock or so) RA65 vented front brakes (10mm bigger than stock) and now that i have been doing some reading i am thinking of upgrading the master cylinder.


My reasons for doing this from what i have researched are: (feel free to shoot me down if you know better!)

- Bigger master equals more fluid to the front and rear calipers (bias valves aside)
- Results in a pedal which will not be as soft in its travel and will firm up sooner due to increased speed at which the caliipers will be filled with fluid.


Now i have heard mixed reports about the pedal EFFORT required with a bigger master, most say more effort but some have said less, i guess this depends on how much bigger than stock the brake upgrade is and how much bite your pads have?

stock is 7/8 from what my sources say so the next size up is 15/16. What will fit RT142? Its a different bolt pattern to AE86/ke70 booster.



Now another issue i had a look at wat the adjustment of the shaft of the brake booster where it enters the master cylinder. On some cars this is adjustable with a nut and if its only 1mm out before touching the piston in the master this can have a massive effect on the brake pedal feel, making it spongy and soft like mine. Im yet to have a look and see if RT142 is adjustable but will pull the master off in the next week to have a look. Im so sick of these shit brakes especially now that the thing is turbo i want a hard, good pedal!