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  #1  
Old 06-30-2022, 05:54 PM
RicoB's Avatar
RicoB RicoB is offline
 
Join Date: Mar 2017
Location: Glendale, CA
Posts: 462
Lightbulb Brake disc thickness on RV9a

I got a question, since I can make it to my hangar for couple of days would anyone know the thickness of the standard RV9a disk rotor?
The reason I ask is because I got my hands on a set of grove calipers (2 pistons) model number 31-2M I was told that it requires a 1/4” disk. I currently have Cleveland/Parker 30-9 but I can’t find any info about what disk thickness it uses 1/4” or 0.182”?
I was hoping to be able to just drop the grove calipers in.
Thanks
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Rico Burgos
2018- RV9a at AZ82 and KWHP
1959- C-150 at KMOD (Sold)
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  #2  
Old 06-30-2022, 08:46 PM
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bhester bhester is offline
 
Join Date: Jan 2005
Location: Hopkinsville, KY
Posts: 1,068
Default This might help, maybe not!

My RV7A wheels, tires and brakes:
Cleveland wheel 5.00-5 PN: 40-78B
Brake disk PN: 164-17
Min. thickness 0.167” / 4.242 mm
Rapco brake disk: RA164-01700
Brake puck o-ring AN6227B-23
Brake Pads: Repco 06-00651
Tire: AirHawk 5.00-5 6ply
Tube: Aero Classic Leakguard

You should be able to find the disk thickness on Cleveland’s site.
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N857BH RV7A XP-O360 - Garmin G3X ADS-B IN/OUT 2020 Compliant
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  #3  
Old 07-01-2022, 01:16 AM
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RicoB RicoB is offline
 
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Location: Glendale, CA
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Default

i am sure the 9 is just like that. it won't be the 1/4" thick disks.
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2018- RV9a at AZ82 and KWHP
1959- C-150 at KMOD (Sold)
https://www.imdb.com/name/nm3018529
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  #4  
Old 07-01-2022, 02:17 AM
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PaulvS PaulvS is offline
 
Join Date: Aug 2019
Location: Western Australia
Posts: 1,136
Default 9A disk thickness

I've helped put new tires on our -9A and the brake disks are definitely not 1/4" thick, they are thinner, even accounting for wear.
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Building RV-6A #22320 O-320 FP. Wings and tail complete, fuselage almost done, working on canopy.
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build
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  #5  
Old 07-01-2022, 07:34 AM
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9GT 9GT is offline
 
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Location: Southern Michigan
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You can easily “upgrade” the standard discs to the thicker ones. Off hand I don’t have the part numbers in front of me but I did it on my -9A. My concerns were overheating and warping the standard discs. Somewhere on the forum is a thread or two that includes part numbers if you are so inclined.
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Howell, MI
RV-10: #41686 Under Construction/Sold 2021
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
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  #6  
Old 07-01-2022, 08:06 AM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 638
Default

Quote:
Originally Posted by 9GT View Post
You can easily “upgrade” the standard discs to the thicker ones. Off hand I don’t have the part numbers in front of me but I did it on my -9A. My concerns were overheating and warping the standard discs. Somewhere on the forum is a thread or two that includes part numbers if you are so inclined.
I did the Matco high energy upgrade on my 9A a couple of years ago. I believe they are 0.17" minimum thickness rather than 0.13", but don't quote me. I know the OP has different brakes. This is the best single upgrade I've done on the plane, I went from having frequent overheating to the point of having to add lots of power to taxi after a short stop landing, to having plenty of brake and no overheating whatsoever.
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Last edited by Flying Canuck : 07-01-2022 at 09:59 AM. Reason: fixed thicknesses
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  #7  
Old 07-01-2022, 09:33 AM
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RicoB RicoB is offline
 
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Location: Glendale, CA
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Yeah I will do the upgrade for sure. I am getting the full grove brake kit from a friend ( calipers, masters, parking valve, ss hoses, except the disks) the system was using DOT4 brake fluid. I will be changing all the O rings over to 5606 Compatible. Not sure about the hoses if I can clean them off and re-use it . At the moment I wasn’t planning on changing it all over yet. I just wanted to install the caliper but seems that I will have to get the thicker disk.
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2018- RV9a at AZ82 and KWHP
1959- C-150 at KMOD (Sold)
https://www.imdb.com/name/nm3018529
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  #8  
Old 07-01-2022, 09:37 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 6,669
Default

Quote:
Originally Posted by RicoB View Post
Yeah I will do the upgrade for sure. I am getting the full grove brake kit from a friend ( calipers, masters, parking valve, ss hoses, except the disks) the system was using DOT4 brake fluid. I will be changing all the O rings over to 5606 Compatible. Not sure about the hoses if I can clean them off and re-use it . At the moment I wasn’t planning on changing it all over yet. I just wanted to install the caliper but seems that I will have to get the thicker disk.
Just a reminder to consider the effects of additional thickness of the disc. Like caliper spread (add spacers), clearance from disc to pants bracket, and trimming the axle nut. SCARD did a good post about this back pre 2017. Good luck finding it.
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RV-7
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  #9  
Old 07-02-2022, 05:37 AM
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GeoffP GeoffP is offline
 
Join Date: Sep 2018
Location: NSW, Australia
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Default

3/16" .187 new
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