05-25-2020, 12:09 PM | #1 |
Drives: 2017 2SS M6 FIFTY Join Date: Sep 2019
Location: RVA
Posts: 34
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Brake calipers bolts help needed
Hello everyone! I'm a novice on self-maintenance, having a blast learning to keep my 2017 2SS ready for track days and HPDE.
I'm stuck on installing GM's track brakes cooling kit, more specifically with removing the 4 piston Brembo front calipers' bolts: 1. What are the right size bolts? 19mm and 3/4 are little lose, 17 and 11/16 won't fit. Are these 18mm or 23/32? 2. The bottom caliper bolt is in a tricky angle, even with the sterering wheel all turned in to the right. Are swivel sockets an appropriate solution here? Can I use my impact wrench + swivel sockets to lose these two piston bolts? 3. Can I reuse these piston bolts every time I install/remove the track brake cooling kit before/after track time, as long I'm using the correct spec threadlocker? Thanks in advance! |
05-25-2020, 12:40 PM | #2 | |
2020 Shadow Gray 2SS
Drives: 2020 2SS - A10, NPP, MRC, CAI Join Date: Dec 2019
Location: SoCal
Posts: 3,029
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Quote:
If you turn the wheel all the way you can get an 18mm deep socket and a standard impact wrench on both bolts. Yes, you can reuse the bolts, proper torque 148 ft/lb. Thread locker is Loctite 272
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2020 SGM 2SS - A10, NPP, MRC, Red Calipers, Black Camaro Fender Badge, Footwell Lighting
Added after delivery: - GMP CAI, GMP Black Strut Tower Brace, MRR017 1LE Wheels, SS Armrest, Black Fuel Door, Stainless Sport Pedals, SS Wheel Caps, Black Lugs/Locks, GM Splash Guards, DD Smoked LED Markers, Smoked Rear Reflectors, Mishimoto Catch Can, Xpel PPF - Full Front, SunTek 35% Tint, CeramicPro coating, RST Stainless Brake Lines, Castrol SRF, MSD Super Conductor Wires Left: My "fun" ride. Right: My "work" ride: a Gulfstream G600. One's top speed is 180 Mph, the other, 620 Mph... |
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05-25-2020, 01:04 PM | #3 |
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I know it's been debated on here before but those are torque to yield bolts... Which means that they stretch when they're properly installed and I replaced mine when I did my rotors for peace of mind. Plenty of people have reused those bolts though and I've never heard of any failures... So really I guess it's a personal choice.
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05-25-2020, 01:52 PM | #4 | |
2020 Shadow Gray 2SS
Drives: 2020 2SS - A10, NPP, MRC, CAI Join Date: Dec 2019
Location: SoCal
Posts: 3,029
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Quote:
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2020 SGM 2SS - A10, NPP, MRC, Red Calipers, Black Camaro Fender Badge, Footwell Lighting
Added after delivery: - GMP CAI, GMP Black Strut Tower Brace, MRR017 1LE Wheels, SS Armrest, Black Fuel Door, Stainless Sport Pedals, SS Wheel Caps, Black Lugs/Locks, GM Splash Guards, DD Smoked LED Markers, Smoked Rear Reflectors, Mishimoto Catch Can, Xpel PPF - Full Front, SunTek 35% Tint, CeramicPro coating, RST Stainless Brake Lines, Castrol SRF, MSD Super Conductor Wires Left: My "fun" ride. Right: My "work" ride: a Gulfstream G600. One's top speed is 180 Mph, the other, 620 Mph... |
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05-25-2020, 04:14 PM | #5 | |
Drives: 2017 2SS M6 FIFTY Join Date: Sep 2019
Location: RVA
Posts: 34
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Quote:
About the torque, service manual says 111 lb ft first pass and 15-30 degrees 2nd pass. What does that 1st and second pass means? https://imgur.com/a/Or4ZHHC EDIT: Nevermind, found out what torque+angle means. Gotta use a tool like this for the second final pass: https://www.autozone.com/test-scan-a...uge/141510_0_0 Last edited by Ren Lacerda; 05-25-2020 at 04:26 PM. |
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05-25-2020, 04:28 PM | #6 | |
2020 Shadow Gray 2SS
Drives: 2020 2SS - A10, NPP, MRC, CAI Join Date: Dec 2019
Location: SoCal
Posts: 3,029
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Quote:
I would say first pass, tighten both to 111 lb/ft and then go back to each and tighten an additional 15°-30° of turn (I'm guessing that will put you somewhere near 148 lb/ft of torque )...
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2020 SGM 2SS - A10, NPP, MRC, Red Calipers, Black Camaro Fender Badge, Footwell Lighting
Added after delivery: - GMP CAI, GMP Black Strut Tower Brace, MRR017 1LE Wheels, SS Armrest, Black Fuel Door, Stainless Sport Pedals, SS Wheel Caps, Black Lugs/Locks, GM Splash Guards, DD Smoked LED Markers, Smoked Rear Reflectors, Mishimoto Catch Can, Xpel PPF - Full Front, SunTek 35% Tint, CeramicPro coating, RST Stainless Brake Lines, Castrol SRF, MSD Super Conductor Wires Left: My "fun" ride. Right: My "work" ride: a Gulfstream G600. One's top speed is 180 Mph, the other, 620 Mph... |
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05-25-2020, 04:45 PM | #7 | |
Drives: 2017 2SS M6 FIFTY Join Date: Sep 2019
Location: RVA
Posts: 34
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05-25-2020, 08:12 PM | #8 |
Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
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all of the fasteners are metric even though there are standard equivalents of some sizes
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05-25-2020, 08:42 PM | #9 | |
Drives: 2017 2SS M6 Join Date: Jun 2013
Location: WNY
Posts: 7,070
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Quote:
there are no torque to yield bolts except maybe the head bolts. iv measured then all with a micrometer. none stretched and GM even states now you can reuse the caliper bolts.
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real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1
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05-26-2020, 04:59 PM | #10 |
Drives: 2017 2SS M6 FIFTY Join Date: Sep 2019
Location: RVA
Posts: 34
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05-27-2020, 09:23 AM | #11 |
Drives: 2013 C6Z06 Join Date: Nov 2016
Location: PA
Posts: 1,577
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Just leave the kit on, plenty of us do with no issues and it's really not worth the hassle of removing every time. If you are against that I would still say only remove the actual air deflector on the control arms and not worry about removing the calipers to put the rotor shield back on.
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05-28-2020, 06:34 PM | #12 |
Drives: 2016 Camaro SS 2017 Yukon Denali Join Date: Jan 2020
Location: Colorado
Posts: 116
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A torque angle spec does not mean it’s a torque to yield bolt. The yield point could affect the reading on a torque wrench so all tty bolts are installed with torque angle specs.
Torque angle is more reliable as it takes the friction out of the equation when tightening the bolt to the stretch the engineers intended. On these brake bolts simply using a liquid thread locking compound instead of the dry the new bolts come with would change the torque reading. Torquing to 148 lbs would result in more stretch on the bolt with the liquid. |
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