SHOULD BRAKE LINES BE DOUBLE FLARED?
                     SHOULD BRAKE LINES BE DOUBLE FLARED?
Mark Sanford
Writer at Brake System
University providing advice, reviews and information on 
brake system components including brake line repair cost, 
replacement ABS sensors, brake line repair kit.
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IS DOUBLE FLARING BRAKE LINES ABSOLUTELY NECESSARY?
In short, the answer to this question is a resounding “Yes!” Car brake lines 
should be double flared simply because considerable pressure is inflicted 
on them through the hydraulic system. Let’s take a closer look at the 
differences between double flared brake lines and single flared brake lines 
and dig deeper into why it makes sense to double flare these critically 
important lines.
DOUBLE FLARED BRAKE LINES COMPARED TO SINGLE FLARED BRAKE 
LINES
Double flared brake lines are considered the OEM standard for vehicle 
braking systems, which means they are that much safer than the single 
flared variety. Double flared brake lines really do make it that much easier 
to avoid a brake line risk and other problems related to pressure within the 
brake line.
There is a widespread belief that brake lines of the single flared variety no 
longer exist. However, the truth is single flared lines are used on vehicles 
that have not been properly repaired by mechanics. The bottom line is 
single flared brake lines are not going to be in a vehicle unless someone 
has performed repair work on the brake system and failed to put the 
system back together in the proper manner.
WHY DOUBLE FLARED BRAKE LINES ARE PREFERABLE
The double flare brake line fitting is quite common in automobiles made, sold, 
and driven throughout the United States and Asia. The purpose of adding double 
flared brake lines to a vehicle is to minimize friction wear along with cracking at 
the flare that has the potential to create a leak within the line.
Though bubble flared brake lines also exist, this type of line fitting is primarily 
found in vehicles driven in Europe. The bubble flared brake line variety is used in 
automobiles that have high-pressure systems. However, the overarching moral of 
this story is no vehicle should have single flared brake lines. The single flared line 
is inherently hazardous to the vehicle’s braking system as well as to you and all 
other occupants in your vehicle.
Even if your auto mechanic or one of your favorite automotive website writers 
favors single flared or bubble flared brake lines, you should resist the temptation 
to add them to your vehicle. It is unsafe and even illegal to drive a vehicle with a 
brake system comprised of single flared fittings. If you plan on adding fittings to 
your vehicle’s brake system on your own, spend the money necessary to purchase 
a high-quality flaring tool that creates the perfect double flared fittings. Pay the 
premium for this tool, sweat the small stuff when adding the double flared 
fittings, and you won’t lose any sleep worrying about a potentially devastating 
brake failure while you are out and about.
About Brake System U
Brake System University is a micro site giving advice, reviews, and technical 
information on various brake system components like brake lines, brake 
line kits, and ABS sensors. Brake System University connects you to high 
quality, genuine brake system replacement parts including  replacement 
brake lines, replacement ABS sensors, replacement brake line kits that 
have been tested and reviewed by experts. If you want to replace any 
component of your brake system, then this 
site(https://brakesystems.autopartsu.com/) will helps you in choosing the 
right component. Brake System University connects you to trusted reviews 
and referrals to help you easily make a purchase decision.