No, the 86+ also used both brands but not the same versions as pre-86.

According to VW Parts,

86-88 used Girling (some late 88 ATE)
89-91 used ATE

Mark

ddbjorkman@verizon.net wrote:
> Can one assume from that that '86 and up used the ATE?
> Dave B.
>
> -----Original Message-----
> From: David Beierl <dbeierl@GMAIL.COM>
> To: vanagon <vanagon@GERRY.VANAGON.COM>
> Sent: Mon, Jan 13, 2020 10:56 am
> Subject: Re: Pin Insetion on Front Calipers
>
> On Sun, Jan 12, 2020 at 10:13 PM Skip L <skiplaubach@gmail.com> wrote:
>
>> The calipers that I have are definitely ATE.  Ken has excellent photos on
>> his website at Vanagain.com to compare Girling to ATE.  Thanks Ken!
>>
>
> Girling hardware:
> https://germansupply.com/front-brake-hardware-kit-bus-vanagon-80-85-w-girling-calipers.html
>
> ATE hardware: https://www.busdepot.com/13020
>
> Yrs,
> d
>