Re: rear disc conversion
Posted: Thu Sep 22, 2016 12:56 pm
That's what I put isn't it :p
Page 2 of 2
Re: rear disc conversion
Posted: Thu Sep 22, 2016 1:18 pm
I swear I read smaller pistons too? must have been a instant edit
Re: rear disc conversion
Posted: Thu Sep 22, 2016 1:37 pm
he edited both postsSherwoodNash wrote:I swear I read smaller pistons too? must have been a instant edit
Then again the difference in piston size between the aisin and Lucas calipers is so small there won't be much of a difference in force anyway.
Re: rear disc conversion
Posted: Thu Sep 22, 2016 2:03 pm
Nah you're all mistaken 
There isn't that much difference in size... but I get a lot less rear end lock up than I was expecting.
I was planning to see how it went and maybe get a bias valve if necessary... that was about 3 years ago
It's quite funny to do it on purpose though, at low speeds the back tyres make a chirping noise as the tread skids along the road lol
There isn't that much difference in size... but I get a lot less rear end lock up than I was expecting.
I was planning to see how it went and maybe get a bias valve if necessary... that was about 3 years ago
It's quite funny to do it on purpose though, at low speeds the back tyres make a chirping noise as the tread skids along the road lol
Re: rear disc conversion
Posted: Fri Sep 23, 2016 7:57 am
Aisin's are 51mm, Girling are 48mm.
That's 2042.82 square mm vs 1809.56 square mm, or about 12% bigger. Your front/rear bias is about 1:0.88.
I'm running the Rover's on the rear, which are 30.2mm (716.31 sq mm). My front/rear bias is about 1:0.35. Ideally you want between 1:0.5 and 1:0.33, so I'm on the low end of that scale, but with SPOA that's probably a good thing due to brake dive.
I want to remove the brake bias valve as it's designed to provide a small amount of pressure constantly. This is causing my SJ to eat up rear pads every 1000 miles or so. Drums need a tiny bit of "preload" pressure apparently, so the bias valve does that. With my brakes set up the way they are, there's no need for a bias valve at all, so at some point I really need to get under there and rip that thing out.
That's 2042.82 square mm vs 1809.56 square mm, or about 12% bigger. Your front/rear bias is about 1:0.88.
I'm running the Rover's on the rear, which are 30.2mm (716.31 sq mm). My front/rear bias is about 1:0.35. Ideally you want between 1:0.5 and 1:0.33, so I'm on the low end of that scale, but with SPOA that's probably a good thing due to brake dive.
I want to remove the brake bias valve as it's designed to provide a small amount of pressure constantly. This is causing my SJ to eat up rear pads every 1000 miles or so. Drums need a tiny bit of "preload" pressure apparently, so the bias valve does that. With my brakes set up the way they are, there's no need for a bias valve at all, so at some point I really need to get under there and rip that thing out.