Hi, I need to replace the master cylinder on my '91 GTi 8v. I've bought a new one from euro parts. The new one has two bottle holes and 6 ports - 2 on each side and two on the bottom. From what I can see, my master cylinder only has 2 ports - left hand side as you look from the front. There are no blanks in the box and I am wondering if 4 holes plus a bottle hole is too many to blank and I perhaps have the wrong part? Anyone know what to do?
If its got 2 ports either side (4) and the 2 for the bottle then just put 2 bleed nipples in the spare ports its what I did!! Seems strange its got 6 as well as the 2 for bottle prob wrong one!
It's a Padgid part like this one - 2 on top, two each side and bottle ports on top. It's listed on halfords and ecp as the correct part but I am sure it's wrong. Time to take it back! Thanks!
I would take that back as it's not the correct one This is what yours should look like. http://www.vwspares.co.uk/product_info.php?products_id=2037
You could use it as an opportunity to upgrade to a bigger master cylinder, You'll need one of these; https://www.vwheritage.com/vw_spare...hop.product_pID_34848514.htm?crumbStartPage=1 And 2 of these https://www.vwheritage.com/vw_spare..._shop.product_pID_195184.htm?crumbStartPage=1
they have sold you a mk1 master cylinder, or summat else random. mk2 ones are either be 2 or 4 ports. as above if you end up with 4 ports block the spares with bleed nipples, generally a decent make will come with proper blanks to do the job
That's exactly what it said on the box - Golf MK1. It has been duly returned. When you say upgrade - will this make the braking better? (Sorry for being thick) Everything else is brand new and standard. It's kind of a no brainer as they don't have stock of the direct replacement anyway! Thanks!
Yes the 16v master cylinder is a bigger bore than the 8v one. Gives a nice firm pedal essential if used with the later 16v bigger brakes or g60 280mm brakes should you wish to go bigger later on.
Thanks everyone - works a treat! Getting the reservoir bottle on really hurt Just as an aside - how far should the pedal go before the braking starts - it's really firm so I don't think there's any air, but travels a little further than I would like, I'm guessing this isn't adjustable?
yeah you cant adjust the biting point, the clevis pin o nthe servo to pedal joint will only change the height of the pedal. once the air is out thats all you can do!
Horrible weather for it right now, but you could try checking/setting up the rear callipers. If they're not right wound out right it will affect the pedal. Do late 8v have 16v front brakes? Otherwise a 22.2mm M/C is a downgrade.
I'll def check the rear calipers when the weather is kinder - supposed to be good this weekend ... The rear calipers are new as are pads. Not sure what front brakes it has, but replaced the master cylinder with a 16v one anyway. I need to check the balance valve too, the spring is movable when the car is empty but I think it might be a little too loose. It stops well though - straight and pretty quick, just an inch or two of play before.
If your pads are literally brand new, it can take a little time for them to bed in, which will in turn bring the biting point up a little. Make sure you bleed the master cylinder too, release the 2 blanking plugs until fluid steadily streams out, trapped air here cant escape and will make the pedal travel further.
