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Post by sidta23 on May 27, 2008 6:48:55 GMT
Hi Gerardo i would look at the master cylinder before th servo you should have good brake pedal without the booster, mates ta23 has gave him lots of brake trouble like yours & problem was master cylinder also friends 131 sport same problems brake fade & the cure new master cylinder
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Post by alfazer on May 27, 2008 9:02:42 GMT
Brake fade and "spongy pedal" are two different things. Brake fade is where the system is working properly but the discs and pads overheat and fail to grip properly. (I've never known the servo to give trouble, except for the vacuum hose, but that won't make things feel spongy. ) The soft pedal thing is about a problem with air/fluid/weak hose and will happen even when the brakes are cold. Brake fade only happens when very hot and feels different from "spongy" Sidta23 is right about it sounding like a master cyl problem; poor seals or corrosion in the bore, and if the master cylinder is poor then nothing else will work properly. Take the seals out of the cylinder and have a look inside. (don't forget to use the the little release screw on the side of the cylinder) After spending all the money on hoses etc. it's worth doing a really good check for trapped air. When bleeding, keep wiggling and tapping the hoses to dislode any air. You can also try moving your foot off the pedal sideways so the pedal jumps out quickly each time. This can help get the air moving upwards as well. (but it works even better on systems with no servo). Or try using a pressure bleeder. It's also worth trying to add the new fluid from the calliper, injecting it through the bleed valve so it goes up through the system, pushing the air in front. That's the direction the air wants to go naturally so it's worth a try. (but don't try topping-up an ABS system like this) Leave the brake pedal pressed down overnight with something like a stick wedged against the seat. This can dislodge air bubbles too. Check the next morning for any fluid leaks around the master cylinder, callipers, and all the hose and pipe unions. It's also easy to remove the M cyl from the servo to check for leaks around the rear end of the cylinder. With good seals, master cylinder and braided hoses, the brakes should be nearly rock-hard. Al
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Post by sidta23 on May 27, 2008 22:02:42 GMT
Well said Al well my car is finally finished & insured & driving well, have brand new rear louvers that i sat on the rear screen & said no not for this car, so i am now finishing my end of this thread with 2 pics, thanks Nick.
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seanh
Highschool Graduate
Posts: 27
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Post by seanh on Jun 11, 2008 4:01:11 GMT
sidta23 .......... That car looks amazing! Now that you've finished yours, do you think you could find time to give me a hand with mine? I'm trying to work on the handling of mine at the moment. She is wobbling in the corners way too much, and when trying to power out of the corners she just spins the inside rear wheel. I'm going to attempt open diff surgery in a couple of weeks to sort the spin problem, but I'm still unsure as to what can be done with the awful body roll issue. Here's a pic to show you what I mean :
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Post by alfazer on Jun 12, 2008 19:29:56 GMT
Hi Seanh Aren't you better starting a new thread for this where a more relevant title will get people interested? It's getting lost in here and maybe missing out on someone's expertise.
(If those shots are taken at max cornering limits then I don't think the roll looks that bad. Compare with old pics of 70's or 80's saloon car racing. ) Very basically, I think stiffer anti-roll bars (or sway bars depending on where you're from) could sort out the body roll but first check that the bushes are in good shape. If it's a real GT I think they have a rear bar as standard, but a AE86 Corolla one is similar and plenty of diameters/brands to pick from. Polybushes on their own, make a surprising difference too. Don't forget though that changing antiroll bars makes a difference to the under/oversteer characteristics. The car looks lowered so you should have a shorter (or adjustable) panhard rod at the rear to keep the axle centred. I think the LSD needs looking at if the inside wheel is spinning a lot, but you know that anyway. Do some research on springs, ARBs, handling, etc. If you are racing you REALLY need to get familiar with this stuff or get an engineer who does. all the best with it Al
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seanh
Highschool Graduate
Posts: 27
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Post by seanh on Jun 14, 2008 17:42:59 GMT
It's not the GT, it has had a conversion to the 18rg engine, but the rear axle is still from the ST. Though I do have the internals of the LSD from a GT axle, which I'm hoping will fit in my current diff housing. Hopefully, that will sort out the wheel spin issue.
I don't know what the ride height of these is meant to be, I've never seen another gen1 Celica before! But I would like some more height, especially at the rear, I need to space the wheels out at least an inch to fill the arches, but there is insufficient clearance there. Maybe this car has had lowering springs fitted, if so, can I get hold of standard springs, or will I have to get some re-manufactured?
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Post by alfazer on Jun 15, 2008 10:37:30 GMT
You don't want the standard springs if you're driving it like this. Way too soft and your body roll problem will be worse. I have Supplex springs on mine. A bit harder than standard but still far too soft for track use. Those arches are modified; wider than standard so you could get at least a 8x15" wheel in there, with the right offset. Don't know the answer to your diff question, but a GT one will be hard to find. A complete AE86 Corolla axle, with a little bracket modifying, can fit. Gives you LSD, about an inch wider track and some had disc brakes too. AL
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Post by sidta23 on Jun 15, 2008 20:44:29 GMT
.i have dobinsons lowering springs all round lowered 30mm 25% stiffer & they are hard. check out the aussie & yank sites for info on handling as these guys really go to town on their cars, you should fit the AE86 rear end as Al said will be a vast improvement & she will drift then! lol.
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seanh
Highschool Graduate
Posts: 27
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Post by seanh on Jun 17, 2008 5:03:45 GMT
How would I go about getting hold of these AE86 goodies?
And am I right in thinking that the front struts, and rear bits fit straight on, or does this process need a little persuasion?
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Post by sidta23 on Jun 17, 2008 7:13:12 GMT
as i said check out the aussie sites & the american celica sites for inspiration toymods classic-celica.com toysport classic celicas & more
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