has anyone upgraded a master cylinder?

[doogal44]

Hi all
i was looking at some brake upgrades and come accross this.


1" Bore Master Cylinder
Details

- Brand new 1" bore Master Cylinder for use with any MR2 braking system.
- Increased pedal feel, reduced total pedal travel
- Compatible with stock lines and fittings.
- Includes new reservoir.
- Two models available, one for ABS cars, one for cars that did not come with ABS originally.
- Units have a 1 year warranty.
MR2 1" Master Cylinder: New w/ ABS, w/ reservoir
New w/o ABS, w/ oversized reservoir
Price: $200.00

I have also read about the larger you go with the bore the easier it is to lock up your wheels.
As i understand it my n/a cylinder curruntly has a 7/8" bore and the turbo cars have a 15/16" bore.
has anyone upgraded this before?
thanks for any info you can give.

[pinkisthenewblue]

I haven't done that and don't intend to but I have had to replace my clutch master cyl to work with a different gearbox. What I'd say is by getting a bigger diameter brake MC your total travel on the brake pedal will be reduced. You'll need more force on the pedal than before for the same brake effort. IMHO this will numb the brakes - how much depends on the diameter change. That's probably why people say it's easier to lock.

[madmr2man]

A bigger diameter master cylinder allows the braking system to shift more fluid, firming the pedal up as the distance required to shift the same volume of fluid has reduced.

Why do you want to shift more fluid?

Do you have bigger calipers fitted, like 4 pots and such like?

Fitting bigger calipers will soften the brake pedal slightly, but un my experience this is negligible and can be offset somewhat by fitting braided hoses and dot 5.1 fluid.

I have nissan 4 pots up front with a stock turbo master cylinder, braided hoses and ap racing fluid, and the pedal is still firm.


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[doogal44]

iI have just supercharged my v6 and was looking at ways to improve the braking system.
i have grooved discs decent pads braided lines. Just still feels like my yaris has a better feel to the brakes. Just saw that and was curious. Might just swap up to a turbo one.

[fingers99]

I usually find that feel (at least, in the sense of being able to easily control what's happening) comes with a stock master cylinder and bigger disks/calipers, rather than the other way around.

If you have Rev 1/2 disks and calipers, Rev 3 would be an easy upgrade.

To my mind many modern cars are simply over servoed.

[madmr2man]

I usually find that feel (at least, in the sense of being able to easily control what's happening) comes with a stock master cylinder and bigger disks/calipers, rather than the other way around.

If you have Rev 1/2 disks and calipers, Rev 3 would be an easy upgrade.

To my mind many modern cars are simply over servoed.

This^^^

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[andyluckhurst]

I have just had the nightmare of replacing my master cylinder. Toyota no longer list the cylinder although they do a repair kit for a mk2 with abs. Having a rev1 3s Dr that was not what I wanted to hear. I found on hear that a hilux master cylinder would fit. The trouble was finding which one.

I found a company in Wales that would rebuild my existing for £170 and a replacement from Japan for £202. After 3 evenings of reading tech data I finally found my match.

The master from a mk3 hilux Ln105 is the match. I contacted a hilux specialist Roughtrax 4x4. I have used these guys before and they are real helpful. There part number BR019 is a direct fit to the stock servo. They sent me over dimensions and a mere £58 Inc vat plus carriage later the cylinder is now in place!

I can't wait to have proper brakes again!!

[chris]

Aaron, I pretty much replaced the complete braking system on your car when it was mine,
- brand new master cylinder
- brand new Goodridge braided brake lines
- brand new (refurbished) calipers
- brand new red stuff pads
- brand new CRN grooved discs

If you feel the braking power isn't enough for the SCV6 then I'd probably recommend upgrading the calipers to 4 pots on the front and adding bigger brake discs. I think the Wilwood kit is generally regarded as the best for the MR2.

Unfortunately this would mean that you'd also have to upgrade the stock 15" wheels you fitted to the car as the discs and calipers wouldn't have enough clearance

[doogal44]

its not that the breaks dont work i am just looking for a firmer feeling pedal and having driven a tubby it just felt much better. And as I understand it a bigger master cylinder provides a harder feeling pedal.
i have looked the break upgrade but like the look of the 15s.
luke at pacific works did reccomend carbotech pads and said they would probably be an inbetween option to increased breaking.

[fingers99]

Can you measure the disks you have? Without that we're pretty much guessing.

But the Rev 3 stuff will certainly fit beneath 15" wheels.

Yep, a bigger master cylinder will -- all things being equal -- give you a firmer pedal (mind you, braided stainless hoses will possibly do the same). The big but is that it will make it harder to hold the car at the sweet spot just before lock-up.

[peteV6R5]

Can you measure the disks you have? Without that we're pretty much guessing.

But the Rev 3 stuff will certainly fit beneath 15" wheels.

Yep, a bigger master cylinder will -- all things being equal -- give you a firmer pedal (mind you, braided stainless hoses will possibly do the same). The big but is that it will make it harder to hold the car at the sweet spot just before lock-up.

I know this car as it was Chris's - posted above and it already has braided hoses, red stuff pads , grooved CRN discs and new calipers.

So the question still is - wilborough front 4 pot upgrade with larger wheels or master cylinder change?

[fingers99]

Well, I'd go for bigger calipers, disks, etc. (of course). But have you driven it Pete? How does it stop? How does it feel? Could it just be in need of a good vacuum bleed?

Hard to know what folk expect -- to my mind the stock set up is adequate (and that's a stock Rev 1 set up!) but lacking in finesse (I've got some Rev 3 stuff to go on but the dust shrouds are horrible so I need to weld up some titanium ones).

[doogal44]

Well like I said I know the turbo master cylinder is a 1/16 of inch
bigger in diameter and the pedal just felt a little better.
if I can get one I think I might just swap it to a turbo one

[peteV6R5]

Well, I'd go for bigger calipers, disks, etc. (of course). But have you driven it Pete? How does it stop? How does it feel? Could it just be in need of a good vacuum bleed?

Hard to know what folk expect -- to my mind the stock set up is adequate (and that's a stock Rev 1 set up!) but lacking in finesse (I've got some Rev 3 stuff to go on but the dust shrouds are horrible so I need to weld up some titanium ones).

Drove it many times as an NA - not driven it since Aaron s had it = so not as V6 or even V6SC.

All I do know it has the same set up as my V6 and I have never felt mine short of stopping power.
Each to their own and if Aaron thinks it needs a bit more then so be it. I don't think the master will actually do as much as he thinks as you have the ABS pump in the way.
The upgrade kit is the way to go but pricey