Rear brakes 85-86 vs 87-89 Mark 1's

mr2tim · 09-29-2009, 01:41 PM

I'm looking at the 85-86 series rear brake and comparing them to my 87-89 series here on the work bench?

I'm being told by a Hollander Parts inquiry that these are different with different part number identification?

They look amazingly identical, both series appear to share the same center to center measurement of the slider pins, same pin diameter, the emergency brake equipment are the same, the openings for the pads identicle.

What the hell is going on here?

Here look at 'em..

Is this a Toyota Illusion or just another manufacturers way of bilking the buying public.?

Doubting Tom

I||ICIT · 09-30-2009, 04:05 AM

same piston diameter?

Papo J · 10-02-2009, 01:11 PM

Remember that not all the parts were changed in 87, toyota still used what was left on the shelves and most changes actually took place with the 88 model year. If I remember correctly the changes were on the size of the rotors and caliper brakets not the calipers.

ToyotaTechGeek · 10-05-2009, 11:13 AM

^^^^

+1

mr2tim · 10-05-2009, 12:31 PM

Yes, both series of rear brakes or the 85-86 and the 87-89 have the same 1- 1/4" measurable face

Quote:

Originally Posted by I||ICIT

same piston diameter?

mr2tim · 10-05-2009, 01:04 PM

Well Pappy, looks likes your brain cells are still in working order.

The rear rotors of the 85-86 series car measure 9 1/2" diameter and the 87-89 series measure 10 1/4" which as you suggested would mandate a different caliper bracket.

Supercharged models use the 87-89 criteria as well.

Being in a measuring mode I found the same goes for the front vented brake rotors as well.

The 85-86 series measures 9 1/2" (5/8" thick)and the 87-89 series cars run a 10" diameter rotor at 3/4" thick.

In conclusion, bro's you can use any caliper anywhere but the brackets and the rotors are gonna drive you crazy

Quote:

Originally Posted by Papo J

Remember that not all the parts were changed in 87, toyota still used what was left on the shelves and most changes actually took place with the 88 model year. If I remember correctly the changes were on the size of the rotors and caliper brakets not the calipers.

ToyotaTechGeek · 10-05-2009, 03:36 PM

Quote:

Originally Posted by mr2tim

Well Pappy, looks likes your brain cells are still in working order.

The rear rotors of the 85-86 series car measure 9 1/2" diameter and the 87-89 series measure 10 1/4" which as you suggested would mandate a different caliper bracket.

Supercharged models use the 87-89 criteria as well.

Being in a measuring mode I found the same goes for the front vented brake rotors as well.

The 85-86 series measures 9 1/2" (5/8" thick)and the 87-89 series cars run a 10" diameter rotor at 3/4" thick.

In conclusion, bro's you can use any caliper anywhere but the brackets and the rotors are gonna drive you crazy

wait till i post pics/specs of my brakes!

traintech86 · 10-05-2009, 04:26 PM

you and your brakes haha!

ToyotaTechGeek · 10-05-2009, 10:55 PM

oh yeah!

bassman54 · 10-06-2009, 03:06 AM

Quote:

Originally Posted by mr2tim

I'm looking at the 85-86 series rear brake and comparing them to my 87-89 series here on the work bench?

I'm being told by a Hollander Parts inquiry that these are different with different part number identification?

They look amazingly identical, both series appear to share the same center to center measurement of the slider pins, same pin diameter, the emergency brake equipment are the same, the openings for the pads identicle.

What the hell is going on here?

Here look at 'em..

Is this a Toyota Illusion or just another manufacturers way of bilking the buying public.?

Doubting Tom

this difference in diameter can be an upgrade for 85-86 MK1's. will result in better stopping power due to increased swept area.

follow this link for a nice write-up:

MKI MR2 Write-ups

09-29-2009, 01:41 PM	#1 (permalink)
mr2tim SUPERcharZed ToyZ RacZer Join Date: Mar 2008 Location: South Florida Posts: 1,789 Thanks: 8 Thanked 118 Times in 111 Posts My Google Map iTrader Rating: (6/100% )	Rear brakes 85-86 vs 87-89 Mark 1's I'm looking at the 85-86 series rear brake and comparing them to my 87-89 series here on the work bench? I'm being told by a Hollander Parts inquiry that these are different with different part number identification? They look amazingly identical, both series appear to share the same center to center measurement of the slider pins, same pin diameter, the emergency brake equipment are the same, the openings for the pads identicle. What the hell is going on here? Here look at 'em.. Is this a Toyota Illusion or just another manufacturers way of bilking the buying public.? Doubting Tom Attached Thumbnails

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09-30-2009, 04:05 AM	#2 (permalink)
I\|\|ICIT Some Skills Join Date: Feb 2009 Posts: 50 Thanks: 22 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	same piston diameter?

10-02-2009, 01:11 PM	#3 (permalink)
Papo J 6SPD GTE Join Date: Sep 2006 Posts: 588 Thanks: 2 Thanked 50 Times in 49 Posts iTrader Rating: (0/0% )	Remember that not all the parts were changed in 87, toyota still used what was left on the shelves and most changes actually took place with the 88 model year. If I remember correctly the changes were on the size of the rotors and caliper brakets not the calipers.

10-05-2009, 11:13 AM	#4 (permalink)
ToyotaTechGeek resident GEEK! Join Date: Mar 2005 Location: ...boosting mid-corner Posts: 995 Thanks: 14 Thanked 31 Times in 31 Posts My Google Map iTrader Rating: (2/100% )	^^^^ +1

10-05-2009, 04:26 PM	#8 (permalink)
traintech86 Cage Fighter Join Date: May 2009 Location: Yokosuka, Kanagawa Japan Posts: 1,799 Thanks: 27 Thanked 47 Times in 43 Posts My Google Map iTrader Rating: (3/100% )	you and your brakes haha!

10-05-2009, 10:55 PM	#9 (permalink)
ToyotaTechGeek resident GEEK! Join Date: Mar 2005 Location: ...boosting mid-corner Posts: 995 Thanks: 14 Thanked 31 Times in 31 Posts My Google Map iTrader Rating: (2/100% )	oh yeah!