Sport "big" brake upgrade nightmare.

Sport "big" brake upgrade nightmare.

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Discussion

l354uge

Original Poster:

2,969 posts

128 months

Sunday 13th January 2019
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Hello,

I have a '99 1.8 Standard model is use for trakdays and autosolos. The rear brakes have binded since i bought it, with a spongy pedal and fronts that are far too keen to lock.
I also bought a '04 euphonic as a parts car, which didn't go too well as it doesn't share a whole lot with my NB and has the rubbish LSD. Only good news is i've made a fair bob from selling bits from it.

So i thought to save money id rather swap the big brakes from the euphonic onto the NB, whilst gaining some heat capacity and stopping power. Apart from the fact ive now had to spend hundreds on new calipers/discs/pads/hoses I've now hit another issue.

To get the correct pedal travel and feel i need a 15/16 brake master cylinder, the NB currently has a 7/8 one. Now, I thought, great ill swap it from the euphonic. No dice, euphonic has ABS (2 ports), NB doesnt (3 ports).

Now what i need to know is: Whats the part number for the correct 3 port, RHD 15/16 master cylinder? and where can I get one? from what i can find only the US has alot of these non ABS cylinders in the right size, but they're obviously LHD!

Help would be appreciated, running out of time before my next autosolo!

Cardo

62 posts

152 months

Sunday 13th January 2019
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Pretty straightforward to use the 2 port 15/16” master cylinder.
You need to use a suitable T piece,fittings,flaring tool and some brake pipe to make a new section that will split the single front port into two lines for the left and right front brakes.
I’ve done a couple of big brake conversions like this and it works perfectly.

l354uge

Original Poster:

2,969 posts

128 months

Sunday 13th January 2019
quotequote all
Good point actually, I've got the tools just need to order this and get to work.

I need to swap the servo over from the euphonic too, right?

Cardo

62 posts

152 months

Sunday 13th January 2019
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Yes,swap the complete servo/master cylinder assembly.
You might have to adjust the push rod to set the pedal height correctly for heel/toe but it's only a couple of locknuts.
I tried the 270/276 brake set up with the standard 7/8" servo and couldn't get on with the excessive pedal travel.The 15/16" cylinder improves it greatly but I did think that it would be even better with a Wilwood 1" cylinder.

l354uge

Original Poster:

2,969 posts

128 months

Monday 14th January 2019
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Thankyou, I will give it a go. You don't happen to have a picture of the modified master cylinder lines do you? Trying to think of the best way to do it

Cardo

62 posts

152 months

Monday 14th January 2019
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Dont have any pictures that I know of...sorry.
Off the top of my head you can use the rear line by reshaping it a little by hand.
The front lines need shortening and straightening a bit so you can flare them and fit unions.
You then need to make a short link pipe to run from the forward cylinder port to the T piece and 2 short bent pipes to join up with the front left and right factory brake pipes.
Hope this makes sense!

l354uge

Original Poster:

2,969 posts

128 months

Tuesday 15th January 2019
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Great thankyou, did you use the existing proportioning valve or go without? Alot of people are suggesting to get rid of the proportioning valve completely

Cardo

62 posts

152 months

Friday 18th January 2019
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Hi,if I remember rightly I used the existing prop valve on both cars.1.8 1800 import models.

l354uge

Original Poster:

2,969 posts

128 months

Saturday 26th January 2019
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So I've fitted the t piece, but for the life of me I can't get the bloody thing to seal. I'm using all original brake pipes so shouldn't be the flares.
Any advice?