servo's and cylinders

[jimbob-mcgrew]

looking to upgrade my servo and master cylinder to accompy the 2.0 brakes, providing i get the servo with the cylinder, do they all interchange between each other ? (connection at the brake pedal side & brake lines from the cylinder) gsi the best one for the job ? cheers.

[Adam]

You dont need change either.
All MC's are the same.

Servo is bigger on a gte/gsi, and yeah it swaps straight over if you want to swap it

[jimbob-mcgrew]

ah... ok, cheers.

any idea what exactly a servo does ?
and would it aid braking to use the bigger gte/gsi jobby ?

[Jack]

Master cylinder is the piston that pushes the brake fluid - larger master cylinder = more brake fluid can be compressed = greater braking effort. However, all Nova ones are the same size (20mm?); I think some Astras use a slightly larger one though (22mm?).

The servo is the bit that assists your pressure on the pedal (and in turn, master cylinder). Bigger servo = less effort required on the part of your foot to push the master cylinder. It won't push it further, it just assists you in pushing it (drive a car with no servo, or with the engine off, and you'll see what I mean lol)

[jimbob-mcgrew]

ah right i get ya, yeh i know that feeling, brakes are crap with the engine off. i think ill look into a bigger servo in that case. cheers :thumb:

the bigger astra ones u speak of, are they a straight swap to a nova too ?

edit: providing you had the servo to go with it i guess, brake line attachment the same ?
i suppose using larger diameter brake lines and union nuts would help out too.

cheers for that info jack, always good to know how something works, gives u a better understanding of what u aim to gain and whats going on on the internal front of things, basically cut short, the greater amount of fluid u can pummel at the calipers, the more effective there gonna work.

[Jack]

I think you need to make up an adapter plate. Have a search for astra master cylinder or servo and you should find suitable results come up :thumb:

I run a standard (1.0 I think) master cylinder and servo on V6 calipers and have great braking efficiency. Although I have about 1/4 travel before the brakes start to pressurize, then about 1/2 travel before they bite. And bite they do :D I'd be concerned with a "better" servo I would hit the bite point too easily and the brakes would jab on too easily.

[AlexW]

I can get the point, only moving my nova around my drive i notice that the brakes bite and lock too early/easy.

[Rich]

get a master cylinder/servo from a 2ltr cavvy, remove the nova servo/mc and you can modify the part that connects to the pedal/brake bar. Will need to cut the connectors off the cav bits and weld the nova connection on. I would get pics but i havent got any lol

I did this on my old 2ltr and the difference was huge! The cav servo slots into the bracket thats bolted to the nova bulkhead, mine was out of a cavvy gsi.

edit- sorry forgot to add, because the cav has abs i had to make up new brake lines, and re-route them. The abs master cylinder has 2 outputs wheres as the nova has 4. Can use two 3-way splitters, or a splitter from a non-abs corsa b/c.

[jimbob-mcgrew]

jack -
yeh, that had crossed my mind while i was thinking about the whole caliper pummeling theory, i guess if the systems too hardcore.. youre gonna be locking up left, right and centre - could make the car dangerous to drive if your not carefull. 1.0 bits on yours is probably the best combo in that respect.

alex -
u and your crappy door handles can piss off lol

rich -
cheers, sounds like alot of work, impressed you managed to pull it off.. but ill keep it in mind, im gonna be sticking to smallblock tho, so probably dont need as brutal brakes as yours.

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i think what ill do, cos i havent even bled my brakes yet, since i upgraded the calipers/discs/pads, is bleed the system thru and adjust up the rears all cushti, then deside if im happy with the result and upgrade further based on that.
if the pedals feels anything like it did before ill be happy with that, cos it was a nice controllable feel, just like jack was mentioning, only thing is the brakes should actually stop the car this time, standard brakes are useless, i was worried to drive the car at times, especially in certain conditions.. the newer cars out today.. if one of those stamps on his anchors infront of you, youve had it prety much.. you aint gonna stop in time.. best u can do is get the hell out the way and go round him.

cheers for info lads.. appreciate it :thumb:

[loggyboy]

Corsa Brake pedal/servo setup is the best option! Bit of a mission to convert though!