Bought copper nickel 1/4" brake line to replace the lines from the master to the EBCM.
Can't get the darned fittings onto the new line.
Must I buy new fittings or can the existing fittings be drilled out or am I overlooking something in my presently aggravated state?

TIA

You need 3/16" line, not 1/4"

_________________
Andrew - owner/operator of Bonnevilles Unlimited

2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
1997 Corvette | 55k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
2014 Town & Country Limited | Cashmere Pearl | 95k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 260k | Official Bonneville Hauler

While I can't speak for what the '00+ stuff came with from the factory, I know that all the '92-'99 came with 6mm lines between the master and ABS module, and 4.75mm lines to each wheel.

All the brake lines in the stores are SAE, so 3/16" (4.76mm) & 1/4" (6.35mm). If you had the 6mm lines, you had to drill out the fitting to get the 1/4" line in. The other fun part is getting a bubble flare tool to fit a 1/4" line. The only other option is to use an adapter that converts the bubble flare fitting to a standard double flare fitting.

I would not drill out a 3/16" fitting to fit a 1/4" line, you lose the radius/shoulder on the end that seals it off and the sharp edge would cut into the line.. So don't do that if your fittings were not originally sized for 6mm line.

_________________
Boost addict


The Fleet:
'93 SSEi - Twincharged + manual Build thread
'97 Camaro - Top swap
'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'99 Montana - top swap 3800
'04 Sierra 2500HD - LLY Duramax

Current project:
Something cool, trust me.

Upcoming projects:
'92 Bonneville SSE
'87 LeSabre T-type
'67 LeSabre

Gone to greener pastures:
'84 Sierra Classic - Twin turbo 3800
'97 LeSabre - Top swap

RIP:
'86 LeSabre - pictures
'93 SE - L67

Or just buy the correct lines and be done with it:

https://amazon.com/ACDelco-25698848-Equ ... 00H91NP6O/
https://amazon.com/ACDelco-25698855-Equ ... 00H91NQA4/

_________________
Andrew - owner/operator of Bonnevilles Unlimited

2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
1997 Corvette | 55k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
2014 Town & Country Limited | Cashmere Pearl | 95k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 260k | Official Bonneville Hauler

MKMike, keep us posted on how the final repairs go and what it took to do so.

As I mentioned, I am soon going to have the enjoyment of replacing brake lines myself.

My 2000SLE brake lines are starting to look pretty rusty.(surprise here in Wisconsin)
The company I am looking at is Inline Tube located in Michigan.
They have a 9 pc. stainless steel brake set for Bonneville (2000-2005) for $180.00.
Website inlinetube.com.
Phone number (800) 385-9452.
This looks like a good possibility.

Also where have you been lately MKMike?

Thanks.
Doug.

Sorry for the late reply.
Changing the MC lines was easy enough. In road salt states, soaking the line ends with Kroil is helpful.
Actually needed to cut one line and tap a socket on it to get it removed.

The problem with all the aftermarket lines that I've seen for the master cylinder is that they have no strain relief---they're just solid lines, without any coiled or flexible section--unlike the ACDelco OE parts which have 2 flexible segments per line.

Glad I was missed, Doug.
Had 2 family members hospitalized, more than once, these past few months.
Both are nearly fully recovered now.

MK Mike.
Sorry to hear about your 2 family members.
Hope things are now better.
I know how those things take priority.
I lost my father in law in July and my mother in October.
Hopefully 2019 will be a better year.
Does the strain relief make that much of a difference?
If so I guess ACDelco OE parts are the way to go.