Hi everyone, lovely hot day.
Can anybody help me? I have a 1995 Fiat Ducato MWB small motorhome, just checked the rear brakes and noticed there was what looked like brake fluid around the dust cap, so looks like I need to change the piston rubber seals on both rear wheels, my question is, do I need to bleed the brakes after I have changed the rubber seals, only the nearside brake nipple has broken off, and on the front wheels, there are 2 nipples per wheel and 3 of them are completely rusted and some idiot before has done the head in, don't think I'll ever get them off.
Can I just bleed one side at the back and get away without bleeding the front ones?
Cheers
Mike

Hi,
if the side you pull apart is the side you can still bleed , then YES you should be fine,
I've never heard of air being SUCKED back into other parts of the system,

TBH I would syringe out most of your fluid from the servo reservoir and fill with new , that way what you've bled through will be nice + clean

charlie

Thanks for your advice, depending on the price, I think I'll change the cylinders, does anyone know what bore size are?, chap on ebay (see link) http://www.ebay.co.uk/itm/360673221839?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2648 selling them very cheap £7.90 for 2 postage, but he says the bore sizes are different and one he is selling is - 25.4mm, I didn't think it would make a difference if it's a complete unit?
Also how and where would I clamp the pipe? they seem to be metal pipes, not rubber?
Thanks
Mike

m4mike said:

Thanks for your advice, depending on the price, I think I'll change the cylinders, does anyone know what bore size are?, chap on ebay (see link) http://www.ebay.co.uk/itm/360673221839?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2648 selling them very cheap £7.90 for 2 postage, but he says the bore sizes are different and one he is selling is - 25.4mm, I didn't think it would make a difference if it's a complete unit?
Also how and where would I clamp the pipe? they seem to be metal pipes, not rubber?
Thanks
Mike

Click to expand...

You have to keep the same size pistons, even if you change the entire cylinder.

Bigger pistons mean you need to push more fluid into the cylinder to move the pistons, so it'll increase pedal travel, and also mess up the amount of fluid going front to back, so it'll affect braking performance.
Even worse if it's just on one side at the back, at it'll affect left to right across the axle.

There will be a rubber pipe from the body of the van to the axle, metal pipes either side.

Thanks for that Mikey, do you or anyone else know what the bore size is, save me taking it all apart and trying to measure it?
Does the one on ebay seem the right one, the guy says the bore size of the one he is selling is - 25.4mm.
I'm gonna get 2 if they are the right size, seems very cheap?
Cheers

m4mike said:

Thanks for that Mikey, do you or anyone else know what the bore size is, save me taking it all apart and trying to measure it?
Does the one on ebay seem the right one, the guy says the bore size of the one he is selling is - 25.4mm.
I'm gonna get 2 if they are the right size, seems very cheap?
Cheers

Click to expand...

Whats your vin number

My vin number is - ZFA23000005121946
Cheers

Look into the replacement of any brake parts now, as in the case of calipers you can only get reconditioned ones as no pistons or rubbers are available, best to look at replacing with new recon ones or new, rather than trying to get parts which might not be available, when you shop around,

Thanks, have decided to go for the ones from eBay (link above) from phoning around various parts places, they all come back with the bore size being 25.4mm.
What type of brake fluid is best to use, i.e. dot number, or doesn't it matter?
Cheers

Standard dot 4 will be fine.

That's what I though.
Cheers

2 liter petrol that must be expensive to run.

Original part numbers: 9945891
26.99mm


TRW was the OEM, LPR part number: 4486

You can see all the competitor part numbers on the lpr site:
http://lpr.it/e-idraulicascheda.asp?LPR=4486

Plenty of firsline and veco ones on ebay. The ones you've orde willprobably fit though.

Hi Moodrater, yes petrol not to clever, only just done one fuel check and it did 22mpg, but that was fully laden with water tank full, aqua roll full, tank of petrol, loaded up 2 people, short runs and blowing exhaust, hope fully will be better on longer runs with new exhaust etc?
I don't know how that compares with a diesel?

I have now changed the 2 rear brake cylinders with the ones I bought off ebay, motaquip new old stock, but the bore are 25.4mm so slightly smaller, and also the backing bit where the bolt holes are which fits in the cut out in the backing plate was again slightly smaller, and although all the bole holes married up, there was a bit of a gap around it.
I bled the brakes, test drove and all seems ok, do you think it does matter if my original ones are slightly bigger? I herad it would be worse if the replacement ones were bigger then smaller?
Cheers
Mike

I have a 6 wheel ducato and have just replaced the wheel rear brake linings, master cylinder and slave cylinders, calipers and have pressure bled the system but still have a spongy pedal with the engine running. Any ideas?

Hose clamp to isolate calipers cylinders one ata time or in pairs will tell you if theres an issue there. If discs are lipped pads sitting on the lip can cause that. Could be.bulging hoses or if you have abs the pump might need bleeding.