Brake master and caliper combo

MMamdouh · Post by **MMamdouh** » Wed Nov 14, 2007 12:02 pm

hi guys

you all know i have swapped my rotors and calipers on my 1.5 SOHC lanos and i am using the 1.6 spec calipers and rotors... i haven't swapped my master yet and i have some questions regarding the next step.

first off i'd like to mention that the 1.5 SOHC setup has 17mm piston calipers and 20mm master while the 1.6 got 19mm piston caliper and 22mm master

idealy i'd get the 1.6 master and have a copy of the 1.6 spec lanos but i am seeking the optimum braking performance so i was thinking of the following:

putting back my 17mm piston calipers on the 1.6 bracket (assuming it will fit as i didn't test that yet) and that will cure the long pedal travel i am experiancing now with the bigger piston calipers... my concern is the force applied on the pads as i think this will mean that their is less power applied on the pads now with the smaller pistons

swapping the master with the bigger one is a must but what if it was done with the 17mm piston calipers not the 19mm? this will be great as far as the pedal responce and travel area but i recon it will lead to a heavy pedal feel and also i am concerned with the force applied on the pads with this setup... i still can custom made a brake booster vacuum tube to get more vacuum assistance but i am concerned about safty here as i hate to mess with the brakes too much.

what do you guys think? got recommendations or warnings you want to add here?

MMamdouh

gse_turbo · Post by **gse_turbo** » Wed Nov 14, 2007 5:22 pm

one word, hydra-boost! i love it, it removes the vacuums as its power source and instead uses line to and from the power steering. by using the pressure from the power steering you can go from 500lbs of braking force to upwards of 5,000lbs! what i usually do is go to the scrapyard and pull a complete system (pedals, booster, master, brackets...) from a Chevy Avalanche or some GM truck with diesel motor. another upside is the this type of booster is less than half the size of an air booster so you can mount the booster closer to the firewall and gain a TON of space under the hood. the other upside to pulling this system from a streeted car (truck) is the feeling at your foot is every bit as soft as any production vehicle.

Post by **Efratech** » Wed Nov 14, 2007 5:38 pm

?

i have an old 88 lemans, with the 256mm rotors/calipers and to be honest i dont understand what youre looking for with the bigger master cyl.

i havent had problems with this in neither of my Racers, both stoped very nice unless youre doing rally or circuit racing hehehe.

Post by **Efratech** » Wed Nov 14, 2007 5:41 pm

i remembered doing a couple laps on our local circuit track and didnt have problems. but i didnt do any huge late braking or stuff like that, but getting over 180 on the main straight into a 3rd gear fast corner and didnt have issues.

gse_turbo · Post by **gse_turbo** » Wed Nov 14, 2007 5:49 pm

perhaps the lines need to be bled a couple more times?

garrett

MMamdouh · Post by **MMamdouh** » Thu Nov 15, 2007 2:14 am

the brakes on the 1.5 SOHC lanos sucks big time... any one knows that in Egypt, you say you got no issues with braking from 180 km/h... i can easly produce smoak from my pads after 3 to 4 times consecutive braking from 100 km/h... i actually got heavy smoak some 6 weeks ago when i was going for an appointment and i was too late and was driving flat out, at the red lights the pads were smoaking heavly and it is fair to say at this point i got no brakes at all.

this happened with my current car, dad's car and some friends of mine as well so it is not a driver/car/pad type issue, ok some might argue this is a pad issue but i got the same with OEM pads and 3 aftermarket types of pads so i think it is just the fact that the 1.5 SOHC brakes setup is too weak for that car so it works too damn hard trying to brake the car and produce too much heat that no pads can take... it is the same setup on a matiz for crying out loud so how can it perform on a 1036 kgm car??.

Efrain: i think the 256 you mentioned is a typo as in the brake spec. chart i got their is only 330mm and 356mm so i recon you got the 356mm rotors which is similar to the 1.6 DOHC brake setup and this is why you got no braking issues... i am tempting to get that same setup on my car and so far i did get the 356mm rotors on along with the 19mm calipers but i still have the 20mm master cylinder so the setup is not a 100% copy of the 1.6 DOHC yet

the use of the smaller master caused the pedal travel to increase... and as per a formula i was using it increased by some 19% which is too much for my likings and i recon it is not that safe either

my question here is regarding the use of the 17mm calipers (OEM 1.5 SOHC calipers) on the bigger rotors regarding the braking power... will that have any bad effects on the grip applied by the caliper on the pads?

also a good upgrade would be to use the 22mm master cylinder on the 17mm calipers, according to the formula i was using this will even shorten the pedal travel by some 17% with enhances the brakes responce... i think this will make the pedal a bit heavier too... right?

so as you can see i am attempting to find the better caliper/master combo that will give me the best braking performance... i already got mysef the bigger rotors and it did improve braking... the 1.5 SOHC is well known for bad brakws and it is beeing mocked here and tagged "brake and pray" cars 'cause each time to brake you shoul pray that the car will actually stop.

please help a fellow woo owner stop confidently.

MMamdouh

MMamdouh · Post by **MMamdouh** » Thu Nov 15, 2007 2:15 am

gse_turbo wrote:one word, hydra-boost! i love it, it removes the vacuums as its power source and instead uses line to and from the power steering. by using the pressure from the power steering you can go from 500lbs of braking force to upwards of 5,000lbs! what i usually do is go to the scrapyard and pull a complete system (pedals, booster, master, brackets...) from a Chevy Avalanche or some GM truck with diesel motor. another upside is the this type of booster is less than half the size of an air booster so you can mount the booster closer to the firewall and gain a TON of space under the hood. the other upside to pulling this system from a streeted car (truck) is the feeling at your foot is every bit as soft as any production vehicle.

great idea but it is a "no can do" in this country... i wish it was.

MMamdouh

MMamdouh · Post by **MMamdouh** » Fri Nov 16, 2007 5:36 pm

the small caliper didn't fit the 1.6 bracket... it is 1mm off the mark so just forget all about this post

MMamdouh