Brakes. Rarely is something accidentally c*cked up so severely than in a modified braking system. Deliberate bodges occur in everything else but at least if the hundreds of forum threads/posts I have read are to be believed, lots of people undertake 'upgrades' to their brakes and then complain that they are sh*te. I sincerely hope I'm not going to fall into this camp!
So, as most of us know, the E30 servo is a big old thing and to fit pretty much anything other than a stock E30 engine or another 4-banger (e.g. SR20, YB), something needs to be done about clearance between the servo and the engine. There are 3 solutions:
1) Relocate the servo. I have seen them moved to the front of the engine bay or to the passenger footwell.
2) Fit a smaller servo. I.e. Clio, VW Polo etc.
3) Remove the servo and make up for the loss of assistance in some other way - or not.
My original plan was to go the common Clio servo route. Well documented, easy, cheap. But this plan was flawed in that my 5-stud setup had calipers at the front with the biggest pistons known to man and calipers at the back with titchy little pistons. This meant that the back brakes would be doing pretty much nothing, even when braking really hard. All I would be doing would be paying for new rear discs and pads twice a year as they rusted to nothing from lack of use. So, if I wanted to make the most of my brakes, I had little option but to go for a full aftermarket pedal box. I don't know how many of you have considered this option, but it's not cheap! My heart sank.
So I looked at various options from the universal ones from the likes of Tilton and OBP, bespoke E30 ones and even Mk1/2 Escort ones - as these are significantly cheaper. I thought if I could get one of these, I could hoik it down to the local engineering shop and get it modified to fit into the stock E30 pedal box holes.
Again, being in no rush here, I took my time considering options and then my favourite kind of part popped up in the for sale section here. A 2nd hand unused one. Moreover, it was the bespoke E30 floor-mounted pedal box from OBP, complete with cylinders, reservoirs, feed lines, bias bar and remote adjuster. That's about £650 worth of kit brand new. I got it for less than half that
Now unused stuff is all fair and well, but as I didn't know how long the master cylinders have been sitting around for and in what conditions, I didn't want to take any risks. So I whacked these ones on Ebay as untested and bought some new Wilwood ones, in the sizes calculated by a spreadsheet I got checked by Geoffbob. Sizes I now forget. Anyway, the clutch m/s I ordered based on the size of the stock E36 item (as I would be using an E36 clutch slave cylinder). I then proceeded to bolt the lot together, excluding the throttle pedal for now. Lots of PTFE lube was used.
Following recommendations from various documents I read, I fitted large washers either side of the bias bar spherical bearing and made sure the clearance of the pivots from the washers was no more than 2 mm yet allowed plenty of free movement.
[imghttp://farm9.staticflickr.com/8385/8570849163_f01fed99b6_b.jpg[/img]
Ready to go in the car:
This didn't go to plan either. The f*cker wouldn't fit right, no matter what I did! I even resorted back to OBP's engineering drawings and measured all the angles - but no, the pedal box was fine. Then on closer examination, I found that there was a tiny dent in the floorpan, beneath where the throttle pedal had been mounted. This was sufficient to throw the fitment off completely and I guess it had been caused by numpty tyre fitters using the 'jacking pads' to lift the car. Anyway, some panel beating later, it was nice and flat and the pedal box fitted snugly. I could now brace myself to drill holes in the floorpan to fit it. If you've never done this before, it's a nervy moment! But I measured again and again and knelt and prayed and the holes drilled right. I then made some spreader plates to go underneath the floorpan out of 2mm x 30mm bright steel bar.
I used low-profile hex bolts so there nothing to catch my heels on in the car and skateboard grip tape to protect the footwells.
Next job was to figure out how I was going to route my brake lines. With the stock pedal box, master cylinder and servo gone, I had to do everything from scratch. First up was to cover the now obsolete gaping holes in the firewall. I did this with a sheet of 1 mm aluminium, some pop rivets (more chassis drilling *sigh*) and some gasket sealant. I made a card template, with holes marked in for the brake lines and then cut the ally piece.
The bolts you see are M8 bolts that fit into the stock pedal box bolt holes - minimised the number of holes I needed to drill for pop rivets!
I then fitted some bulkhead brake fittings for front brakes and clutch (rear would run through the car), a grommit for the flexi-lines to the reservoirs and a 'custom' mounting point for the t-piece to mount the hydraulic brake light switch.
The stock pedal box holes are M8 - but an M8 bolt wouldn't fit in the t-piece. So I cut a bit off a piece of M8 threaded bar and turned it down using a file and my grinder. I then gut an M6 thread onto the thinner bit and the T-piece bolted up just fine to this.
So, first I decided how I was going to route my front brakes and to make sure I got it right, I made dummy lines up with cheap copper first.
Then I used these as patterns and started to make nice kunifer lines.
But once again, there was a problem. The problem was with the bulkhead fittings. They just didn't feel right when I torqued them up. When I undid them and inspected what was left of my flare, I saw this.
The male part of the fitting was cutting into the flare rather than sitting inside of it. I was scratching my head for a week over this then I just decided to order some bulkhead fittings from a different supplier - Rally Design. When the new ones arrived and I compared them, this is what I saw:
The old one is on top - the new one is on the bottom. Looks like the originals were for 1/4" pipe to me and not 3/16". Either way, with the new fittings in place, everything went together like Meccano.
I also stripped the heater panel of sound deadening and gave it a coat of satin black, along with the gearbox cross-member.
And I managed to fit my anti roll bars. A 14 mm rear ARB (325i) and a 22.5 mm (iirc) front ARB from a 325i Cab.
And all of this means, as of a few weeks ago, my engine bay looks like this:
I do still need to do the front-rear brake line. But next chapter will skip back in time a few months again to cover some of the other bits I've picked up.