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lx brake repair

lx brakes

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#1 _davewendy_

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Posted 04 November 2021 - 08:40 AM

Hi everyone, i am about to start the revamp of my lx that i have had for many years. The front brakes were binding on when i brought it back from the paint shop some 5 years ago, do i upgrade the brake system? or do i repair the calipers with a kit and redo m/cyl and booster until i get it on the road to keep original for roadworthy, or do i not have to get engineers / brake test etc, for a roadworthy if i upgrade them with sat say a rod shop upgrade set? It was originally a 4 cyl by the tags , but was last registered with a 253, when i bought it in 2000 from nsw and got it registered in vic

 

 



#2 Toran the Carbarian

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Posted 04 November 2021 - 11:37 AM

Don't muck around. Get an all new rod shop or Hoppers kit straight away. You won't regret it, unless you want to keep your original wheels. The Hoppers kit on my 253 LH absolutely transformed it.



#3 _davewendy_

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Posted 04 November 2021 - 01:42 PM

thanks Toran, not worried about the wheels as going to go 17inch hotwires, the ones on it are only 7" and 8" 14's and were always a bit small with the bolt on guards. did you have to get engineers with the hoppers kit ?



#4 _davewendy_

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Posted 04 November 2021 - 01:45 PM

by the way i bought a upc kit a few years back but after reading about it on here am hesitant to use it,



#5 dron

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Posted 04 November 2021 - 06:05 PM

UPC 287mm kit fit and workes well on my UC with a 355 in it. Do not know what there other kits are like.



#6 Zook

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Posted 04 November 2021 - 06:29 PM

I've got a UPC kit on my one tonner with LS1. Looks good. Don't they use Falcon parts?

#7 ls2lxhatch

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Posted 04 November 2021 - 08:25 PM

To be legal, aftermarket brake kits require engineering.



#8 Ice

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Posted 04 November 2021 - 10:46 PM

To be legal, aftermarket brake kits require engineering.



Correct



#9 _davewendy_

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Posted 05 November 2021 - 06:15 AM

Thats what i thought Ice, so would probably be better to redo original brakes, get it on club rego, then go the upgrade front and rear afterwards, and i bought the 330 mm kit , which is the one that has the clearance issues i think



#10 Cook

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Posted 05 November 2021 - 09:05 AM

Hi David. My Hoppers kit came with an engineers cert. UPC may do the same. Cheers Ron



#11 neglectedtorana

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Posted 05 November 2021 - 11:56 AM


Although I have Wilwood calpers, when I went through engineering the engineer commented that it was an easier approval process with Hoppers or UPC type kits as they used calipers and rotors already approved on Falcons etc

#12 _davewendy_

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Posted 05 November 2021 - 06:51 PM

ok thanks, got no paperwork wioth the upc kit. think the 330 kit uses ve calipers .



#13 dattoman

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Posted 05 November 2021 - 08:01 PM

UPC didn't even supply fitting instructions or a receipt I'm told

 

Yes Hoppers will provide the engineering paperwork



#14 ls2lxhatch

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Posted 06 November 2021 - 02:08 AM

To make an aftermarket brake kit legal you have to do the following.

 

If you have engineering paperwork for the kit then you can give it to the engineer but it makes little difference. You still have to go the the process.

 

Fill in an application to modify a light vehicle list the brake modifications to be made.

Get approval in principal from DOT to fit the brake kit.

Contact an engineer to inspect and test the brakes, the approval in principal will specify the brake testing. 

Take the vehicle with the engineers report to be inspected by DOT.



#15 axistr

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Posted 06 November 2021 - 07:05 AM

100% correct Andy, I'm regularly asked to supply an engineering certificate for the power steering racks. Yes I can supply them with an engineering certificate but it means nothing because the report will not have the details of the customers car or ownership and not recognized by their local transport authority. Personally I'm not a fan of the Hoppers kits as they recommend swapping the stubs from side to side so the calipers are behind the front stub axles. This causes clearance issues with the calipers hitting the K-frame on full lock in most cases. They only need to change the mount bracket slightly and the 287mm kit will fit front mounted. I have made 287mm & 298mm kits front mounted with no problems why cant they.   



#16 _davewendy_

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Posted 06 November 2021 - 06:00 PM

so in short i am really better to replace/repair the original brakes to excellent condition to save a lot, they used to work fairly well from memory way back, and i used to drive it pretty hard



#17 _davewendy_

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Posted 06 November 2021 - 06:03 PM

and i am putting a mild 355 stroker in it not over the top, will improve the booster from single diaghram to dual 8" so they should be better with slotted rotors as well



#18 ls2lxhatch

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Posted 06 November 2021 - 08:43 PM

In my opinion the factory Torana brakes are barely adequate. If you are planning on buying new rims then that would be the best time to make a decision on the stud pattern and upgrade the brakes.

 

The Engineers Certificate is valuable where a component needs to be tested to destruction. The Engineers Certificate for the Hoppers LX brake upgrade covers the calliper adaptor plate and the stub axle.


The adaptor plate and stub axle were tested to confirm they could withstand a greater force than the force required to induce wheel skid on a 1200kg car. The force required to induce wheel skid on a 1200kg car was calculated be the certifying engineer at 1854 Nm. A stub axle with the brake kit was mounted on a test rig. The disc was clamped in the calliper and a force applied to the disc. The stub axle calliper mount holes fractured and the adaptor plate deformed with a load of 3423 Nm ( 185% overload ). On this basis the conversion kit is deemed to be suitable for the intended application.

 

The engineer that signs off on the brake kit once it has been fitted to the car can refer to the Hoppers Engineering Certificate to confirm the kit components are capable of handling the forces generated. If the brake kit does not have an engineering certificate then the engineer may request the components are tested to destruction or may be able to compare the components used with components in the Hoppers Kit to reach a conclusion on their ability to handle the forces generated.

 

The engineer would then need to check the kit has been installed correctly with suitable grade bolts and there a no clearance issues. Once the installation has been inspected, the brakes are tested on the road to confirm the brakes are balanced and measure the braking force generated (G force).






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