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maniaxzero

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    STI Master Cyl. and Brake Booster SWAP SUMMARY for LGT

    in Walkthroughs :: Performance Modifications

    Posted

    Well, that's not exactly correct. On the Legacy, the brake check valve is not built inside of the booster. It is external to the booster, but uses a different type of mounting than the STi booster. The LGT check valve is on the end of the hose and is press-fit into a rubber sealing grommet on the booster itself. On the STi Booster, there is a 3/8" Hose connection for the vacuum line. I'll take some pics of both to show what i'm referring to...

     

    I'll actually be doing this swap either this week or next and going to take a lot of pictures and measurements and will be writing a DIY Walkthrough of the whole process. I'm not going to use the STi check valve though. I'll be using an inline brake check valve from either a Toyota Supra or Nissan S13 or S14...

     

    You're absolutely correct about the location of the check valve on the lgt booster. I just popped open the engine bay and saw what you were referring to.

     

    The information I had before was from reading through the other thread and making a summary out of what i've read. I havent done this swap yet.

     

    Thanks for the correction.

     

    One other thing for anyone looking to do this swap...

    Depending on where you get your parts from, in addition to bench bleeding the M/C you might also want to consider flushing the s**t outta your master cylinder as well. Most of us will probably buy these parts from a recycler or off of ebay, etc. The problem with these places is that they pull the parts and store them. Depending on how they're stored, crud and contamination can develop inside...especially since brake fluid is hygroscopic and absorbs moisture from the air. When I got my STi M/C there was A LOT of contamination inside of it...almost looked like they stored the damn thing outside in the rain. I used a LOT of brake fluid to flush out the thing MULTIPLE times and you shoulda seen the crap that came out of this thing...definitely not stuff you would want to push into your brake system. Just doing a regular bench bleed wouldn't have done it either. Anyway, I took a pic or 2 of how I flushed it so when I do my DIY Walkthrough i'll post those as well...

     

    Really looking forward to that DIY Walkthrough and how you properly flushed the MC..

    STI Master Cyl. and Brake Booster SWAP SUMMARY for LGT

    in Walkthroughs :: Performance Modifications

    Posted · Edited by maniaxzero

    Do you have P/Ns for the STI MC and Booster? And not sure where the check-valve fits in the description above. It doesn't show on the diagram, and I don't see it in the picture, so any help is appreciated.

     

    I dont have the P/N for the STI MC/Booster but here's a link for the part

    http://www.ebay.com/itm/05-06-07-SUBARU-IMPREZA-WRX-STI-OEM-BRAKE-BOOSTER-MASTER-CYLINDER-GD7-EJ257-/290677186936?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item43adb5e178#ht_1904wt_1163

     

    As for the check valve, it's basically inside the hose, you have to cut open the STI hose, take out the STI check valve and stick it in your oem legacy vacuum hose. Reason being that the legacy hose is 4x longer than the STI hose.

     

    //Correction from atchipmunk:

    On the Legacy, the brake check valve is not built inside of the booster. It is external to the booster, but uses a different type of mounting than the STi booster. The LGT check valve is on the end of the hose and is press-fit into a rubber sealing grommet on the booster itself. On the STi Booster, there is a 3/8" Hose connection for the vacuum line.

    STI Master Cyl. and Brake Booster SWAP SUMMARY for LGT

    in Walkthroughs :: Performance Modifications

    Posted · Edited by maniaxzero

    As per request from swine, I started this thread to break down everything I've read from this thread . Hopefully the mods can sticky this thread

     

    http://i.imgur.com/mQkmH.jpghttp://i.imgur.com/UPdqH.jpg

     

    WHY DO THIS SWAP?

    I'm sure most LGT owners feel that their brake pedal is subpar and inadequate compared to other cars they've driven. Many have tried replacing oem pads, rotors, Stainless Steel lines, Master cyl. brace, and even a brembo swap or Big Brake Kit, only to find that the brake pedal feel still has not improve much.

     

    Finally, swine and many others who's done the STI brake master cyl. + brake booster swap can confirm that doing this mod is single-handedly the most effective way to get a firm and confidence inspiring braking feel like that of an STI.

     

    SUMMARY:

     

    1) You need a 04-05 STI Master Cylinder and Brake Booster (~$80 used on ebay)

     

    2) You need the check valve from the STI.

    If your STI master cylinder/brake booster didn't come with the vacuum hose. You can buy it from the dealer for ~$18. (Part #: 26140FE131)

    Take it out of STI hose and shove it in the LGT hose with a BIC pen(cap off). This will not be easy but with enough patience, you can shove it in.

    Make sure the bullet side of the check valve goes towards the engine and the flat side goes towards the firewall.

     

    #7 from the diagram is the vacuum hose with the check valve inside

    http://i.imgur.com/kr5Ic.gif

     

     

    3) Bench bleed the MC before install or use a power bleeder.

     

    4) Make sure the rod length on the new STI booster is the same as the LGT booster. (It will cause brake lockup problems if it's not the same)

     

    5) Install everything and bleed the brakes.

     

    For those who have done this mod successfully, feel free to add any tips or useful info for this swap.

    • Thanks 1

    Sti Master Brake cylinder swap Qs

    in Suspension/Brakes

    Posted

    To my understanding from reading this thread..

     

    1. You need a 04-05 STI Master Cylinder and Brake Booster

    2. You need the check valve from the STI. Take it out of STI hose and shove it in the LGT hose with a BIC pen(cap off). The bullet side of the check valve goes towards the engine and the flat side goes towards the firewall.

    3. Bench bleed the MC before install or use a power bleeder.

    4. Make sure the rod length on the new STI booster is the same as the LGT booster

    5. Install everything and bleed the brakes.

     

    Did I miss anything?

     

    Assuming someone who's never done a Master Cylinder before and doesn't have a power bleeder, how long should this procedure take?

    Reference of Avaliable Trunk Lip Spoiler: 05-07 Sedan

    in Exterior/Aesthetic

    Posted

    yep they can be found mostly on eBay. Just make sure you search for the correct size at 47 inches

     

    Yes 47 inches is the one I got.

     

    I got it from this ebay seller: audislineclub_uk

     

    Perfect color matching, painted & shipped for $31! Can't beat that!

     

    IIRC, the shipping took like less than a week from Taiwan!

     

    http://www.ebay.com/itm/Painted-Trunk-Lip-Spoiler-Subaru-Legacy-04-09-Sedan-S-/320840721895?pt=Motors_Car_Truck_Parts_Accessories&fits=Model%3ALegacy&vxp=mtr&hash=item4ab398e5e7#ht_3418wt_1396

    Official Tri-State Spotted Thread

    in Tri-State Area

    Posted

    spotted maniaxzero's lgt on the top level of the municipal parking lot in flushing. not sure if you saw my car...i was parked two rows down from where you were.

     

    lol yeah i parked the dirty girl there overnight on NYE so she didnt have to risk getting banged up in the city. I picked her up at 7-8 in the morning but didnt notice your car

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